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Marc Zac Handler, MD, is an acclaimed lecturer and a board-certified academic dermatologist at Kessel Dermatology in Hamilton Square, New Jersey. He is a member of Alpha Omega Alpha Honor Medical Society. Dr. Handler is also an assistant clinical professor in dermatology at Rutgers University New Jersey Medical School. 

He served as a Fellow in the United States House of Representatives and crafted cost-neutral legislation to combat HIV infection. He has received the Congressional Recognition Award three times from bipartisan House members for his work on health care policy and was named a Nebraska Admiral, by the Governor of the State of Nebraska, in recognition of service to the community. He has experience with medical news production, having worked with Sanjay Gupta, MD, at CNN’s medical unit, assisting with medical programming. Additionally, he has been a medical contributor for the Discovery Health program, “Dr. G: Medical Examiner.”

Dr. Handler is a recipient of the prestigious Tatotsu Imaeda, MD, PhD, Academic Scholar Award for his extensive academic work, which includes greater than 30 peer-reviewed publications and five book chapters. Dr. Handler is the only person to be the first author of back-to-back cover articles in the Journal of the American Academy of Dermatology, the leading American journal specializing in dermatology.

Focused on improving health care access both locally and abroad, Dr. Handler has provided volunteer medical care with Project MediShare in earthquake-stricken Port-au-Prince, Haiti. His experience in Haiti led to an invitation to assist the House Foreign Affairs Committee, in Washington, DC, on USAID expenditures. He has since been a volunteer physician at the HIV hospital in Accra, Ghana, and a volunteer Emergency Medical Technician (EMT) in Hoboken, New Jersey. 

Dr. Handler has been an invited guest lecturer around the globe, including Montenegro, New York, Miami, Kuwait, Iran, and Jordan. Dr. Handler holds a Bachelor of Science from the University of California, San Diego, and received his Doctor of Medicine from the University of Nebraska. Dr. Handler completed a research fellowship in pediatric dermatology at the University of Miami with department chairman Dr. Lawrence Schachner, author of Pediatric Dermatology. He completed his residency in dermatology at Rutgers University with Dr. Robert A. Schwartz, providing needed care for the underserved patients of Newark, New Jersey, and military veterans at the East Orange Veterans hospital. He was selected to serve as the program’s Chief Resident during his senior year. He completed a Mohs micrographic surgery and procedural dermatology fellowship at Skin Laser & Surgery Specialists of NY and NJ under the direction of Dr. David J. Goldberg.

David S. Eingorn, MD, is a board-certified ortho​​paedic surgeon specializing in adult reconstructive surgery and general orthopaedics. He is one of the founders of Mercer-Bucks Orthopaedics, with offices in Hamilton, and Lawrenceville, New Jersey, and Langhorne, Pennsylvania. 

Dr. Eingorn graduated with his bachelor's degree in biology from LaSalle University in Philadelphia, Pennsylvania, and received his medical degree from the Temple University School of Medicine in the same city. 

His internship in surgery was carried out at the Presbyterian University of Pennsylvania’s Medical Center and followed by his orthopaedic residency at Thomas Jefferson University Hospital. 

Dr. Eingorn has received recognition as a "top doc" in the region and holds the Universal Halo patent, which is used internationally for fractured spines. He also invented a hip jig for the DePuy Total Hip system. 

Dr. Eingorn continues to stay on top of the newest technologies in the field of ortho​​paedics. He is one of the few surgeons in the area that has trained and performs robotic-assisted surgeries. His hospital staff appointments include active staff status at Capital Health Systems at Hopewell and Regional Campuses in Trenton, New Jersey, and Robert Wood Johnson University Hospital at Hamilton in Hamilton, New Jersey. 

He also serves as an associate staff member at St. Mary Medical Center in Langhorne, Pennsylvania, a consultant for Lawrence Rehabilitation Center in Lawrenceville, New Jersey, and a research consultant for Zimmer Orthopaedics Corporation. 

Dr. Eingorn pioneered outpatient joint replacements in the area and developed an outpatient total joint replacement program at the Mercer County Surgery Center. Membership in several professional organizations, publications, and research are part of Dr. Eingorn’s ongoing professional development and success. 

His professional history spans a variety of experiences and responsibilities, including volunteer surgery duty during the 9/11/01 attacks of the World Trade Center in New York City.

Fredric Kleinbart, MD, is a board-certified orthopaedic surgeon working closely with patients at Mercer-Bucks Orthopaedics, with offices in Hamilton, Lawrenceville, and Princeton, New Jersey, and Langhorne, Pennsylvania. 

He was the former director of sports medicine and was an active member at Hahnemann University Hospital in Philadelphia, Pennsylvania. Additionally, he is an associate professor of orthopaedic surgery at Drexel University College of Medicine. 

He has a Certificate of Added Qualification in Sports Medicine, and for the last five years, he has been an associate master instructor of arthroscopy at the Ortho​​paedic Learning Center, which allows him to teach arthroscopies nationally. 

A graduate of the University of Pennsylvania School of Medicine, Dr. Kleinbart completed his residency training in orthopaedic surgery at Kingsbrook Jewish- Beth Israel Medical Centers and his sports medicine fellowship at Temple University Hospital. 

Dr. Kleinbart’s USA Olympic experience includes serving as the orthopaedic surgeon at the San Diego Olympic training center, as a ringside physician for USA Boxing, and a ringside physician for the Olympic boxing trials. 

He was the head orthopaedic surgeon and co-team physician for Drexel University. He was also the orthopaedic consultant for the American Repertory Ballet and the Princeton Ballet School and has a long history as a team physician for various collegiate and high school teams. 

Dr. Kleinbart has been instrumental in creating specialty sports clinics, including the Arts Medicine Center, the Women’s Sports Medicine Center, and the Pediatric Sports Medicine clinics at Hahnemann University Hospital and the Drexel University College of Medicine. 

Dr. Kleinbart established the Hahnemann University Hospital and Drexel Sports Medicine Arthroscopy lab and is an associate master instructor for various national arthroscopy courses. Currently, he is the Medical Director at Mercer County Surgery Center. 

He frequently lectures on such varied topics as “The Weekend Warrior,” “The Female Athlete," and “Common Orthopaedic Injuries”. He has a special interest in shoulder and knee reconstruction and the Female Triad.

Stephen Cairone, DO, is a board-certified orthopaedic surgeon at Mercer-Bucks Orthopaedics in Hamilton, and Lawrenceville, New Jersey, and Langhorne, Pennsylvania. On staff at MBO for 10 years, Dr. Cairone has over 19 years of private practice experience in Bucks County. He is dedicated to serving the Bucks County Community.

Born in Horsham, Pennsylvania, Dr. Cairone attended Hatboro-Horsham High School, where he was inducted into the Hall of Fame. He went on to Lycoming College in Williamsport, where he majored in biology and minored in psychology. He earned Academic All American honors as a four-year starter in soccer and was selected for all Middle Atlantic Conference in his senior year. 

Dr. Cairone spent the next nine years at the Philadelphia College of Osteopathic Medicine. There, he completed his internship and residency in orthopaedic surgery. He completed his fellowship training in spine surgery at the University of Pennsylvania.

Over the last 15 years, Dr. Cairone has served in several capacities for the American Osteopathic Association of Orthopaedic Surgeons and as the vice president and president of the spine subsection while giving several lectures each year. In 2012, Dr. Cairone was inducted as a fellow of the American Osteopathic Association of Orthopaedic Surgeons as a result and culmination of his work.

He currently serves as an associate clinical professor of orthopaedic surgery at the Philadelphia College of Osteopathic Medicine.

Dr. Cairone’s main area of orthopaedic interest is minimally invasive lumbar fusion surgery, the surgical treatment of herniated discs, cervical disc replacement surgery, fracture surgery, and arthroscopy.

He serves as the chief of orthopaedic surgery at St. Mary Medical Center and the outpatient spine surgical service director at the Mercer County Surgery Center in Lawrence Township, New Jersey.

John P. Nolan, Jr., MD, is board-certified in both orthopaedic surgery and sports medicine. He is one of the founders of Mercer-Bucks Orthopaedics, with offices in Hamilton, and Lawrenceville, New Jersey, and Langhorne, Pennsylvania. 

Dr. Nolan grew up in Huntington Valley, Pennsylvania, and attended La Salle University. He earned his Doctor of Medicine at Thomas Jefferson University in Philadelphia, Pennsylvania. 

He completed his residency in orthopaedic surgery at the Medical College of Pennsylvania, where he earned an appointment as a clinical instructor and completed additional post-residency training in sports medicine at Temple University and the University of Pennsylvania. 

Dr. Nolan was appointed clinical instructor at the orthopaedic division of Laser Centers of America, where he developed laser instruments for use in arthroscopy. 

He has served on the medical executive committee of Capital Health (2002), the Board of Directors at Mercer County Surgical Center (2001-2012), and was the founding director of Ortho​​paedic Trauma at St. Mary Medical Center from 2012-2016. 

Dr. Nolan was one of the first surgeons in the Mercer Bucks area to perform outpatient total hip and knee replacements, as well as the use of computer navigation and robotic-assisted joint replacements. 

He currently serves on the medical advisory board of the Wellness Center at RWJ Hamilton.

Paul W. Codjoe, MD, is a skilled, board-certified orthopaedic surgeon at Mercer-Bucks Orthopaedics in Hamilton, Lawrenceville, and Princeton, New Jersey, and Langhorne, Pennsylvania. He is currently the President of Mercer-Bucks Orthopaedics. 

Dr. Codjoe joined Mercer-Bucks Orthopaedics after spending a year in private practice and another year in fellowship training at the world-renowned Hughston Clinic in Columbus, Georgia. During his fellowship, Dr. Codjoe specialized in arthroscopic surgery and minimally invasive joint reconstructive procedures of the knee and shoulder. Board-certified by the American Academy of Orthopaedic Surgeons, Dr. Codjoe enjoys treating general orthopaedic and sports medicine patients. 

Born in Accra, Ghana, Dr. Codjoe came to the United States in 1989. He earned his bachelor’s degree from Rutgers University in New Brunswick, New Jersey, and subsequently earned his medical degree at Rutgers’ Robert Wood Johnson Medical School. He finished his internship in general surgery and residency in orthopaedic surgery at Temple University Hospital in Philadelphia, Pennsylvania. 

During his training, Dr. Codjoe served as team physician for several high schools and a semi-professional hockey team. A presenter and author on various medical subjects, Dr. Codjoe is a proud member of several organizations, including the American Academy of Orthopaedic Surgeons, the American Orthopaedic Society for Sports Medicine, the New Jersey Orthopaedic Society, and the Pennsylvania Orthopaedic Society.

Dr. Codjoe looks forward to welcoming new and returning patients to the Mercer-Bucks Orthopaedics offices. 

Thomas Bills, MD, PhD, is a board-certified orthopaedic surgeon specializing in adult reconstructive surgery and general orthopaedics at Mercer-Bucks Orthopaedics in Hamilton, and Lawrenceville, New Jersey, and Langhorne, Pennsylvania. He is one of the founders of MBO.

Dr. Bills grew up in Trenton, New Jersey. He earned his bachelor’s degree in biology from Syracuse University in New York. He then moved to Thomas Jefferson University in Philadelphia, Pennsylvania, to complete a PhD in pharmacology and a Doctor of Medicine from Jefferson Medical College, now the Sidney Kimmel Medical College in Philadelphia.

He received advanced training in pediatric orthopaedics at Children's Hospital in Philadelphia; Trauma at Robert Wood Johnson Trauma Center in New Jersey; Joint Replacement at the Hospital for Special Surgery; Osteoporosis at Cornell Medical School; and Bone Tumor at Memorial Sloan Kettering Cancer Center in New York City, New York.

Dr. Bills is an active staff member of Capital Health Systems and Robert Wood Johnson University Hospital in New Brunswick, New Jersey, and an active attending staff at Lawrence Rehabilitation Center in Lawrenceville.

He is an associate staff member at St. Mary Medical Center in Langhorne, Pennsylvania. He serves on the research staff as a visiting scientist at The Hospital for Special Surgery in the Department of Orthopaedic Research at Cornell Medical School in New York City, New York.

He is a consulting staff physician at the Metabolic Bone Disease Service and Osteoporosis Center in the Hospital for Special Surgery at Cornell Medical School in New York City.

Dr. Bills is a member of the National Osteoporosis Foundation and a recognized Certified Fracture Liaison. He is a member of the International Osteoporosis Foundation and the International Society of Clinical Densitometry, where he maintains special certification as a Clinical Densitometrist.

Dr. Bills’s work is supported by the multiple honors and awards he has earned, his membership in various professional organizations, and an extensive bibliography and speaking engagement history.

David Hardeski, MD, is a board-certified orthopaedic surgeon serving patients at Mercer-Bucks Orthopaedics, with offices in Hamilton, and Lawrenceville, New Jersey, and Langhorne, Pennsylvania. He is currently the Secretary/Treasurer at Mercer-Bucks Orthopaedics. 

He grew up in Bensalem, Pennsylvania, and attended Bensalem High School. In 1999, Dr. Hardeski graduated summa cum laude with a Bachelor of Arts in anthropology from Temple University in Philadelphia, Pennsylvania.  

He earned his master's degree in medical science while attending MCP Hahnemann University, now part of Drexel University College of Medicine in Philadelphia, Pennsylvania. 

Dr. Hardeski earned his medical degree from Drexel University College of Medicine and completed his residency training at Maimonides Medical Center in Brooklyn, New York. 

He completed his fellowship training at R Adams Cowley Shock Trauma Center in Baltimore, Maryland (regarded as one of the premier training centers for orthopaedic trauma in the world). 

He was active in clinical research throughout his training and has a number of publications, including a chapter on pediatric humerus fractures.

Frank Colarusso, DO, is board-certified in physical medicine and rehabilitation at Mercer-Bucks Orthopaedics in Hamilton, Lawrenceville, and Princeton, New Jersey, and Langhorne, Pennsylvania. 

Dr. Colarusso maintains double-board certification, having recently recertified with both the American Medical Association, the American Board of Physical Medicine & Rehabilitation, and the American Osteopathic Association. With an attention to detail and passion for continuing education, Dr. Colarusso is proud to provide comprehensive non-operative musculoskeletal, spine, and sports medicine. 

He specializes in MSK neck and back pain, EMG services, acute and chronic pain syndromes with medication management, dry needling, Osteopathic Manual Manipulation treatments as well as ultrasound-guided injections, nerve blocks, and biologics.

After receiving honors at Rider University in Lawrenceville, New Jersey, and Philadelphia College of Osteopathic Medicine in Pennsylvania, Dr. Colarusso remained in Pennsylvania to intern at St. Barnabas Health Care System. He later was the chief resident in Physical Medicine and Rehabilitation at Boston University Medical Center in Massachusetts. 

Previously serving as one of three attending physicians at the 15th largest rehabilitation hospitals in the United States, Dr. Colarusso is proud to serve new and returning patients from the Mercer-Bucks Orthopaedics offices. 

James Scott, DO, is a board-certified orthopaedic surgeon at Mercer-Bucks Orthopaedics, with offices in Hamilton, and Lawrenceville, New Jersey, and Langhorne, Pennsylvania.

Dr. Scott was born in Bergen County, New Jersey, and moved to Montgomery Township with his family. He met his future wife, Risa, with whom he now shares two daughters. 

Dr. Scott is a graduate of Montgomery High School and still has deep ties to Central New Jersey. An early interest in medicine and participation in track and cross country exposed him to orothopaedics and helped lay the foundation for his future career. He went on to study kinesiology with an interest in movement science at Penn State University in Centre County, Pennsylvania. 

Dr. Scott eventually went on to study medicine at the New York College of Osteopathic Medicine and completed his residency in orthopaedic surgery at Rowan SOM (Rowan University School of Osteopathic Medicine) in Stratford, New Jersey. He then completed a one-year fellowship in adult reconstructive orthopaedics at the University of Virginia in Charlottesville, Virginia, and has published research and book chapters. 

After his fellowship, Dr. Scott continued his career in Cooperstown, New York, where he led the joint replacement program, specializing in complex hip and knee reconstruction and revisions. After seven years in Cooperstown, he is excited to return to Central New Jersey and serve the community he considers home.

David S. Eingorn, MD, is a board-certified ortho​​paedic surgeon specializing in adult reconstructive surgery and general orthopaedics. He is one of the founders of Mercer-Bucks Orthopaedics, with offices in Hamilton, and Lawrenceville, New Jersey, and Langhorne, Pennsylvania. 

Dr. Eingorn graduated with his bachelor's degree in biology from LaSalle University in Philadelphia, Pennsylvania, and received his medical degree from the Temple University School of Medicine in the same city. 

His internship in surgery was carried out at the Presbyterian University of Pennsylvania’s Medical Center and followed by his orthopaedic residency at Thomas Jefferson University Hospital. 

Dr. Eingorn has received recognition as a "top doc" in the region and holds the Universal Halo patent, which is used internationally for fractured spines. He also invented a hip jig for the DePuy Total Hip system. 

Dr. Eingorn continues to stay on top of the newest technologies in the field of ortho​​paedics. He is one of the few surgeons in the area that has trained and performs robotic-assisted surgeries. His hospital staff appointments include active staff status at Capital Health Systems at Hopewell and Regional Campuses in Trenton, New Jersey, and Robert Wood Johnson University Hospital at Hamilton in Hamilton, New Jersey. 

He also serves as an associate staff member at St. Mary Medical Center in Langhorne, Pennsylvania, a consultant for Lawrence Rehabilitation Center in Lawrenceville, New Jersey, and a research consultant for Zimmer Orthopaedics Corporation. 

Dr. Eingorn pioneered outpatient joint replacements in the area and developed an outpatient total joint replacement program at the Mercer County Surgery Center. Membership in several professional organizations, publications, and research are part of Dr. Eingorn’s ongoing professional development and success. 

His professional history spans a variety of experiences and responsibilities, including volunteer surgery duty during the 9/11/01 attacks of the World Trade Center in New York City.

Fredric Kleinbart, MD, is a board-certified orthopaedic surgeon working closely with patients at Mercer-Bucks Orthopaedics, with offices in Hamilton, Lawrenceville, and Princeton, New Jersey, and Langhorne, Pennsylvania. 

He was the former director of sports medicine and was an active member at Hahnemann University Hospital in Philadelphia, Pennsylvania. Additionally, he is an associate professor of orthopaedic surgery at Drexel University College of Medicine. 

He has a Certificate of Added Qualification in Sports Medicine, and for the last five years, he has been an associate master instructor of arthroscopy at the Ortho​​paedic Learning Center, which allows him to teach arthroscopies nationally. 

A graduate of the University of Pennsylvania School of Medicine, Dr. Kleinbart completed his residency training in orthopaedic surgery at Kingsbrook Jewish- Beth Israel Medical Centers and his sports medicine fellowship at Temple University Hospital. 

Dr. Kleinbart’s USA Olympic experience includes serving as the orthopaedic surgeon at the San Diego Olympic training center, as a ringside physician for USA Boxing, and a ringside physician for the Olympic boxing trials. 

He was the head orthopaedic surgeon and co-team physician for Drexel University. He was also the orthopaedic consultant for the American Repertory Ballet and the Princeton Ballet School and has a long history as a team physician for various collegiate and high school teams. 

Dr. Kleinbart has been instrumental in creating specialty sports clinics, including the Arts Medicine Center, the Women’s Sports Medicine Center, and the Pediatric Sports Medicine clinics at Hahnemann University Hospital and the Drexel University College of Medicine. 

Dr. Kleinbart established the Hahnemann University Hospital and Drexel Sports Medicine Arthroscopy lab and is an associate master instructor for various national arthroscopy courses. Currently, he is the Medical Director at Mercer County Surgery Center. 

He frequently lectures on such varied topics as “The Weekend Warrior,” “The Female Athlete," and “Common Orthopaedic Injuries”. He has a special interest in shoulder and knee reconstruction and the Female Triad.

Stephen Cairone, DO, is a board-certified orthopaedic surgeon at Mercer-Bucks Orthopaedics in Hamilton, and Lawrenceville, New Jersey, and Langhorne, Pennsylvania. On staff at MBO for 10 years, Dr. Cairone has over 19 years of private practice experience in Bucks County. He is dedicated to serving the Bucks County Community.

Born in Horsham, Pennsylvania, Dr. Cairone attended Hatboro-Horsham High School, where he was inducted into the Hall of Fame. He went on to Lycoming College in Williamsport, where he majored in biology and minored in psychology. He earned Academic All American honors as a four-year starter in soccer and was selected for all Middle Atlantic Conference in his senior year. 

Dr. Cairone spent the next nine years at the Philadelphia College of Osteopathic Medicine. There, he completed his internship and residency in orthopaedic surgery. He completed his fellowship training in spine surgery at the University of Pennsylvania.

Over the last 15 years, Dr. Cairone has served in several capacities for the American Osteopathic Association of Orthopaedic Surgeons and as the vice president and president of the spine subsection while giving several lectures each year. In 2012, Dr. Cairone was inducted as a fellow of the American Osteopathic Association of Orthopaedic Surgeons as a result and culmination of his work.

He currently serves as an associate clinical professor of orthopaedic surgery at the Philadelphia College of Osteopathic Medicine.

Dr. Cairone’s main area of orthopaedic interest is minimally invasive lumbar fusion surgery, the surgical treatment of herniated discs, cervical disc replacement surgery, fracture surgery, and arthroscopy.

He serves as the chief of orthopaedic surgery at St. Mary Medical Center and the outpatient spine surgical service director at the Mercer County Surgery Center in Lawrence Township, New Jersey.

John P. Nolan, Jr., MD, is board-certified in both orthopaedic surgery and sports medicine. He is one of the founders of Mercer-Bucks Orthopaedics, with offices in Hamilton, and Lawrenceville, New Jersey, and Langhorne, Pennsylvania. 

Dr. Nolan grew up in Huntington Valley, Pennsylvania, and attended La Salle University. He earned his Doctor of Medicine at Thomas Jefferson University in Philadelphia, Pennsylvania. 

He completed his residency in orthopaedic surgery at the Medical College of Pennsylvania, where he earned an appointment as a clinical instructor and completed additional post-residency training in sports medicine at Temple University and the University of Pennsylvania. 

Dr. Nolan was appointed clinical instructor at the orthopaedic division of Laser Centers of America, where he developed laser instruments for use in arthroscopy. 

He has served on the medical executive committee of Capital Health (2002), the Board of Directors at Mercer County Surgical Center (2001-2012), and was the founding director of Ortho​​paedic Trauma at St. Mary Medical Center from 2012-2016. 

Dr. Nolan was one of the first surgeons in the Mercer Bucks area to perform outpatient total hip and knee replacements, as well as the use of computer navigation and robotic-assisted joint replacements. 

He currently serves on the medical advisory board of the Wellness Center at RWJ Hamilton.

Paul W. Codjoe, MD, is a skilled, board-certified orthopaedic surgeon at Mercer-Bucks Orthopaedics in Hamilton, Lawrenceville, and Princeton, New Jersey, and Langhorne, Pennsylvania. He is currently the President of Mercer-Bucks Orthopaedics. 

Dr. Codjoe joined Mercer-Bucks Orthopaedics after spending a year in private practice and another year in fellowship training at the world-renowned Hughston Clinic in Columbus, Georgia. During his fellowship, Dr. Codjoe specialized in arthroscopic surgery and minimally invasive joint reconstructive procedures of the knee and shoulder. Board-certified by the American Academy of Orthopaedic Surgeons, Dr. Codjoe enjoys treating general orthopaedic and sports medicine patients. 

Born in Accra, Ghana, Dr. Codjoe came to the United States in 1989. He earned his bachelor’s degree from Rutgers University in New Brunswick, New Jersey, and subsequently earned his medical degree at Rutgers’ Robert Wood Johnson Medical School. He finished his internship in general surgery and residency in orthopaedic surgery at Temple University Hospital in Philadelphia, Pennsylvania. 

During his training, Dr. Codjoe served as team physician for several high schools and a semi-professional hockey team. A presenter and author on various medical subjects, Dr. Codjoe is a proud member of several organizations, including the American Academy of Orthopaedic Surgeons, the American Orthopaedic Society for Sports Medicine, the New Jersey Orthopaedic Society, and the Pennsylvania Orthopaedic Society.

Dr. Codjoe looks forward to welcoming new and returning patients to the Mercer-Bucks Orthopaedics offices.