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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.

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.

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.

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. 

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 N. Feldman, MD, is a highly respected, pioneering orthopedic surgeon who specializes in joint surgery. Dr. Feldman is delighted to be providing services to patients at Active Joints Orthopedics in Englewood, New Jersey, using the most up-to-date technologies and innovative techniques to optimize outcomes for patients.

Dr. Feldman is a leading practitioner in the field of orthopedic surgery and has long been an advocate of computer-assisted, minimally invasive hip and knee replacements using partial joint prosthetics and resurfacing techniques. His research into finding ways of extending the life of replacement hip joints led to the development of metal-on-metal hip replacement surgery at Englewood Hospital and Medical Center.

Among his research efforts, Dr. Feldman played a key role in the design of hip-resurfacing arthroplasties and undertook the role of the clinical investigator for two FDA hip-resurfacing trials that took place at Englewood Hospital and Medical Center and Holy Name Medical Center. Dr. Feldman specializes in customizing minimally invasive forms of surgery to suit his patients’ individual needs and always strives to reduce their recovery times by refining existing techniques.

Dr. Feldman has certification from the American Board of Orthopaedic Surgery and is a fellow of both the American Academy of Orthopedic Surgeons and the American College of Surgeons. He is also a founder member of the Society for the Advancement of Blood Management.

Several honors have been bestowed on Dr. Feldman, including being named Castle Connolly Top Doctors for the New York metropolitan area from 2005-07; a Patient's Choice Award from 2008-09; and Home Care Bergen County’s Physician of the Year award in 1997.