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Omid A. Shaye, MD, brings a wealth of experience and a vast body of knowledge to Gastroenterology Associates of Beverly Hills. He and his Co-Director Dr. Enayati have quickly become the “go-to” doctors for all GI disorders and related treatments in Beverly Hills, California. A strong patient advocate and supporter of educational outreach, Dr. Shaye encourages all of his patients to learn as much as they can about their specific health condition so that he and the patient can work together as a team.

Dr. Shaye has done extensive research on GI disorders and liver diseases, is the author of numerous journal articles and abstracts and has presented on a variety of topics both nationally and internationally. He is a member of the American Association for the Study of Liver Diseases; American Gastroenterology Association; American Society of Gastrointestinal Endoscopy; California Medical Association; American College of Physicians-American Society of Internal Medicine; and American Medical Association. He has certifications from the American Board of Internal Medicine and the American Board of Gastroenterology.

Dr. Shaye received a Bachelor of Science in Neuroscience from the University of California, Los Angeles with a minor in Education specializing in Community Leadership, and he received his Doctor of Medicine from the University of California, San Diego. Dr. Shaye was named “Gastroenterology Fellow of the Year” at the University of California, Los Angeles, awarded by the David Geffen School of Medicine’s Division of Digestive Diseases. 

He was also the recipient of multiple Leo G. Rigler M.D. Awards for outstanding academic achievement at Cedars-Sinai Medical Center. He completed his internship and residency in internal medicine at Cedars Sinai Medical Center. He also did a Gastroenterology Fellowship in the Department of Digestive Diseases at UCLA’s David Geffen School of Medicine. A resident of Los Angeles for most of his life, Dr. Shaye is married to Kelly and they have four young daughters.

About Us

John Rivas, MD, is a triple board-certified gastroenterologist and founder of Rivas Digestive Center in Hollywood, Florida. Dr. Rivas and the team are committed to offering comprehensive, patient-centered gastrointestinal care with the highest level of professionalism, quality, and care.

Dr. Rivas graduated with his Bachelor of Arts in biology from the University of Miami in Coral Gables, Florida. He completed his medical degree at Ross University School of Medicine in Dominica, West Indies, graduating with the highest honors. Dr. Rivas returned to Florida to complete his internal medicine residency at the Florida campus of the Cleveland Clinic and was given the Chief Resident Award. 

To further his training, Dr. Rivas completed a fellowship in gastroenterology at Cleveland Clinic Florida, and a subsequent fellowship in advanced transplant hepatology at the Cleveland Clinic in Ohio. After his training, Dr. Rivas returned to Cleveland Clinic Florida, and served as a staff gastroenterologist and transplant hepatologist in the abdominal transplantation department in 2014. 

Rivas Digestive Center is a culmination of Dr. Rivas’ vast experience in gastroenterology and endoscopy. He offers his specialized training and expertise in various areas of gastrointestinal conditions, including celiac disease, GERD, hepatitis, irritable bowel syndrome, and more. Rivas Digestive Center also offers colon cancer screenings and colonoscopies, and the comfort of a team that’s ready to personalize treatment to each patient and their individual needs. As an active researcher and the primary investigator for several large, multi-center research studies, Dr. Rivas is committed to offering his patients the most up-to-date treatment solutions. 

Rivas Digestive Center is honored to be your trusted health partner and the compassionate team is here to serve your every need. Call the office to make an appointment today or book online. 

Kostas Sideridis, DO, is an osteopathic doctor at Long Island Gastro in Syosset, Long Island, New York. 

Dr. Sideridis earned his degree at the New York Institute of Technology College of Osteopathic Medicine. He then completed his internship at the Wyckoff Heights Medical Center in Brooklyn, New York, and completed his residency at New York University Winthrop Hospital. Dr. Sideridis then went on to complete his fellowship in gastroenterology at the Long Island Jewish Medical Center. After completing his fellowship, Dr. Sideridis helped co-found Long Island Gastro.  

Dr. Sideridis takes the time to listen to patient concerns and discuss the variety of treatment options available. Dr. Sideridis is dedicated to being a partner to patients seeking to improve their overall health. Patients with hepatopancreatobiliary diseases and irritable bowel syndrome have found the relief they need with Dr. Sideridis. He is also a proponent of therapeutic endoscopy to treat a variety of gastrointestinal issues.

For a doctor that cares about patient satisfaction, and offers the best possible treatment, book an appointment online or by phone with Dr. Sideridis.

Jaydeep Kadam, MD, is a board-certified gastroenterologist at Long Island Gastro in Syosset, Long Island, New York. Dr. Kadam majored in public health at John Hopkins University in Baltimore, Maryland. He then went on to earn his medical degree at Ross University School of Medicine. Dr. Kadam later completed his fellowship in gastroenterology at the Long Island Jewish Medical Center in New York.

Dr. Kadam’s vast experience and knowledge of the digestive system have been well documented in countless national publications. He has also been a presenter on gastrointestinal and liver topics on a national level. Currently, Dr. Kadam is a consultant for various pharmaceutical companies as they conduct gastroenterological research. He also serves as the President-elect of the Medical Staff Society at the North Shore University Hospital in Manhasset, New York.  

As a co-founder of Long Island Gastro, Dr. Kadam is involved in assisting patients dealing with various digestive issues. Men and women of various ages have received compassionate and effective treatment for conditions like liver disease, reflux disorders, and heartburn. Dr. Kadam helps many patients prevent colon cancer through regular checkups. His compassionate and understanding approach to patient health ensures that patients receive the care and attention they need from an expert gastroenterologist.

To find relief from digestive issues, book an appointment with Dr. Kadam either online or by calling the office of Long Island Gastro today.

Albert M. Harary, MD, is a board-certified gastroenterologist and internal medicine physician, practicing on Manhattan’s Upper East Side since 1984. Dr. Harary is located at 225 East 57th Street and offers a wide range of advanced diagnostic and treatment services to residents of New York City and Tri-state area.

Dr. Harary is listed as a Top Doctor by the Castle Connolly Guide. He is also a part of the medical staff at both Lenox Hill Hospital and New York University Langone Medical Center, and is a fellow of the American College of Physicians. In addition to his private practice work, Dr. Harary is a clinical assistant professor at New York University School of Medicine and was the director of the GI motility unit at Lenox Hill Hospital for 32 years.

Focused on staying up to date with the latest endoscopic techniques for treating a variety of conditions, Dr. Harary has a special interest in esophageal and gastrointestinal motility disorders, gastroesophageal reflux disease (GERD), irritable bowel syndrome, inflammatory bowel disease, and liver disease. He is a published author, with many of his research papers on gastrointestinal and liver disease and endoscopic techniques appearing in medical journals and book chapters.

A magna cum laude graduate of Harvard College, Dr. Harary earned his medical degree from Columbia University College of Physicians and Surgeons. He completed both his internship and residency in internal medicine and his fellowship training in gastroenterology at the University of Miami Affiliated Hospitals. After graduation, Dr. Harary relocated to the East Side of Manhattan in New York City, where he has been serving patients ever since.

When not assisting his patients, Dr. Harary spends time hiking and enjoying Manhattan with his wife and three children. 

View Dr. Harary's Publications

Nicholas Martinez, MD, is a board-certified gastroenterologist providing complete care for patients at Gastroenterology Clinic of San Antonio. Dr. Martinez found his inspiration for pursuing a career in medicine after observing the health problems suffered by close family members when he was growing up. His experiences still inspire him as a doctor, and his patient, comforting manner reassures people who come to him for care, making them feel like family.

A native of San Antonio, Dr. Martinez speaks fluent Spanish as well as English. He earned his bachelor’s degree from Baylor University in Waco, Texas, before studying medicine at the University of Texas Health Science Center at San Antonio. He then stayed at UT Health San Antonio for his internal medicine residency and gastroenterology fellowship. During his training, Dr. Martinez received a humanitarian award for his outstanding patient care and exemplary bedside manner.

Dr. Martinez has a particular interest in inflammatory bowel disease (IBD), gastroesophageal reflux disease (GERD), and colon cancer prevention. He’s published many scholarly articles in leading medical journals, and regularly presents his research findings at national academic conferences. Dr. Martinez holds certification from the American Board of Internal Medicine, and has a decade of experience helping patients with a range of gastrointestinal disorders.

Murray Orbuch, MD, is a board-certified gastroenterologist with more than 25 years of experience providing expert care at his New York City practice. With two convenient locations in SoHo and the Financial district, Dr. Orbuch is committed to providing his patients with the best possible care, spending unhurried time to fully and accurately diagnose the problem.

In addition to managing general gastroenterology needs, Dr. Orbuch also specializes in Crohn’s disease, ulcerative colitis, irritable bowel syndrome, and Celiac sprue, as well as gastrointestinal endoscopy and colonoscopy procedures. Through his affiliation with the world-class Mount Sinai Medical Center, he is able to provide timely access to the best and latest medical technology, along with other specialty care when needed.

After earning his undergraduate degree, Dr. Orbuch pursued his Doctor of Medicine at the State University of New York-Downstate College of Medicine. He completed his internship and residency at New York University Medical Center and his fellowship in gastroenterology at Georgetown University Medical Center in Washington DC, and The National Institutes of Health in Bethesda, Maryland.

Dr. Orbuch is dedicated to his career and has authored 16 scholarly papers and book chapters and is currently an Assistant Professor of Gastroenterology at The Mount Sinai Medical School. 

Recognized and respected by his patients and peers, he has been continuously voted one of New York City-Metro SuperDoctors® (2010 - 2025), and named to the prestigious Castle-Connolly America’s Top Doctors® directory (2015 -2025).    

Outside of the office, Dr. Orbuch is an avid photographer and wine connoisseur. He’s also conversant in four languages: English, Hebrew, Romanian.

Murray Orbuch, MD, is a board-certified gastroenterologist with more than 25 years of experience providing expert care at his New York City practice. With two convenient locations in SoHo and the Financial district, Dr. Orbuch is committed to providing his patients with the best possible care, spending unhurried time to fully and accurately diagnose the problem.

In addition to managing general gastroenterology needs, Dr. Orbuch also specializes in Crohn’s disease, ulcerative colitis, irritable bowel syndrome, and Celiac sprue, as well as gastrointestinal endoscopy and colonoscopy procedures. Through his affiliation with the world-class Mount Sinai Medical Center, he is able to provide timely access to the best and latest medical technology, along with other specialty care when needed.

After earning his undergraduate degree, Dr. Orbuch pursued his Doctor of Medicine at the State University of New York-Downstate College of Medicine. He completed his internship and residency at New York University Medical Center and his fellowship in gastroenterology at Georgetown University Medical Center in Washington DC, and The National Institutes of Health in Bethesda, Maryland.

Dr. Orbuch is dedicated to his career and has authored 16 scholarly papers and book chapters and is currently an Assistant Professor of Gastroenterology at The Mount Sinai Medical School. 

Recognized and respected by his patients and peers, he has been continuously voted one of New York City-Metro SuperDoctors® (2010 - 2025), and named to the prestigious Castle-Connolly America’s Top Doctors® directory (2015 -2025).    

Outside of the office, Dr. Orbuch is an avid photographer and wine connoisseur. He’s also conversant in four languages: English, Hebrew, Romanian.

Dr. Nancy Lau graduated Magna Cum Laude with a M.D. degree from SUNY Health Science Center at Brooklyn. She has been a Clinical Assistant Attending in Gastroenterology at Memorial Sloan-Kettering Cancer Center, and at St. Vincent's Medical Center.

Dr. Nancy Lau received her BA at Barnard College, Columbia University.  Before becoming a physician, she performed research at the Sloan-Kettering Institute.  As a staff physician at Memorial Sloan-Kettering Cancer Center, she authored a research grant for clinical research.  She has been widely published in peer-reviewed medical journals.  In addition to research, Dr. Lau was an instructor, leading Problem-Based Learning groups for medical students at the Cornell Medical School.  She was co-director of the Gastroenterology fellowship program at St. Vincent's Medical Center in Manhattan, and has trained many gastroenterology fellows.  

Dr. Lau completed her internship at Cornell Weill Medical Center, and residency at Mount Sinai Medical Center, in New York, followed by a gastroenterology fellowship at Columbia University’s St. Luke’s Roosevelt Medical Center, and a liver fellowship at the Mount Sinai Recanati Liver Diseases and Transplantation Center.  She has been named Fellow of the American Gastroenterology Association, and is a member of the Alpha-Omega-Alpha medical honor society.  She is the recipient of the prestigious American Medical Women's Association Janet M. Glasgow Achievement Award.

She brings extensive experience to her practice in a modern, upscale, fully AAAASF certified office-based surgery suite.  AAAASF accreditation means that her procedure surgery suite meets all safety and health standards as required, and is in full compliance with local, state, and federal regulations.  She holds active hospital privileges at NYU Langone Medical Center.

Abraham Chacko, MD, provides gastrointestinal health services to patients at Pelvic Floor Institute, located in Spring, Texas. His aspiration is to "provide complete and thorough care to his patients while taking the time to listen to their needs.

Dr. Chacko grew up in Philadelphia, where he completed his Bachelor of Science and a minor in Spanish at Villanova University. After college, Dr. Chacko worked in research for a year in the Immunology Department at the University of Pennsylvania School of Medicine. He remained in Philadelphia and attended the Philadelphia College of Osteopathic Medicine. He completed his internship and residency in Internal Medicine at the University of Medicine and Dentistry of New Jersey which is now Rowan School of Osteopathic Medicine. He completed his Gastroenterology Fellowship at Riverside Medical Center which was affiliated with Midwestern University School of Osteopathic Medicine in Chicago. 

Dr. Chacko's clinical interests include but not limited to chronic GERD and other esophageal disorders, IBS, diseases of the pancreatic and biliary systems, women's digestive disorders as well as performing advanced endoscopic procedures such as RFA for Barrett's Esophagus and ERCP. As the world of Gastroenterology is changing daily, Dr. Chacko works hard at staying current with the new advances and technology to provide the most innovative care to his patients. 

In his free time, Dr. Chacko is a family man and loves to spend time with his beautiful wife and children as much as possible. He is an avid sports fan especially college basketball and football. He is very excited to have joined the practice and is looking forward to forming lasting relationships with his patients.

Ilyas Memon, MD, is a board-certified gastroenterologist at Texas Digestive Disease Consultants in The Woodlands, Magnolia, and Conroe, Texas. Taking a holistic approach to care, Dr. Memon focuses on his patients’ overall health and well-being, while utilizing the latest in medical technology and treatments.

Dr. Memon is an experienced gastroenterologist who specializes in diagnosing and treating liver disorders and digestive diseases such as colitis, Crohn’s disease, and irritable bowel syndrome (IBS). He’s also adept with endoscopic procedures, including colonoscopy and endoscopy.

After earning his medical degree at Dow Medical College in Karachi, Pakistan, Dr. Memon remained in the city to serve as the house officer in medicine and general surgery at Civil Hospital Karachi.

Dr. Memon then relocated to the United States to complete his internship in internal medicine at State University of New York (SUNY) Health Sciences Center in Syracuse, New York.

He then completed his residency in internal medicine and neurology at Wayne State University-Detroit Medical Center in Detroit, Michigan. Dr. Memon went on to do his fellowship training in gastroenterology at Henry Ford Hospital (now Henry Ford Health System) in Detroit. 

Dr. Memon is board certified in internal medicine and gastroenterology and is a fellow of the American College of Gastroenterology (FACG). 

He’s also a professional member of the American Gastroenterological Association (AGA), the American College of Gastroenterology (ACG), the American College of Physicians (ACP), and the Texas Medical Association (TMA).

Dr. Memon is fluent in English and Urdu. In his free time, he enjoys spending time with his family, reading, and socializing with friends.

Ilyas Memon, MD, is a board-certified gastroenterologist at Texas Digestive Disease Consultants in The Woodlands, Magnolia, and Conroe, Texas. Taking a holistic approach to care, Dr. Memon focuses on his patients’ overall health and well-being, while utilizing the latest in medical technology and treatments.

Dr. Memon is an experienced gastroenterologist who specializes in diagnosing and treating liver disorders and digestive diseases such as colitis, Crohn’s disease, and irritable bowel syndrome (IBS). He’s also adept with endoscopic procedures, including colonoscopy and endoscopy.

After earning his medical degree at Dow Medical College in Karachi, Pakistan, Dr. Memon remained in the city to serve as the house officer in medicine and general surgery at Civil Hospital Karachi.

Dr. Memon then relocated to the United States to complete his internship in internal medicine at State University of New York (SUNY) Health Sciences Center in Syracuse, New York.

He then completed his residency in internal medicine and neurology at Wayne State University-Detroit Medical Center in Detroit, Michigan. Dr. Memon went on to do his fellowship training in gastroenterology at Henry Ford Hospital (now Henry Ford Health System) in Detroit. 

Dr. Memon is board certified in internal medicine and gastroenterology and is a fellow of the American College of Gastroenterology (FACG). 

He’s also a professional member of the American Gastroenterological Association (AGA), the American College of Gastroenterology (ACG), the American College of Physicians (ACP), and the Texas Medical Association (TMA).

Dr. Memon is fluent in English and Urdu. In his free time, he enjoys spending time with his family, reading, and socializing with friends.

Ilyas Memon, MD, is a board-certified gastroenterologist at Texas Digestive Disease Consultants in The Woodlands, Magnolia, and Conroe, Texas. Taking a holistic approach to care, Dr. Memon focuses on his patients’ overall health and well-being, while utilizing the latest in medical technology and treatments.

Dr. Memon is an experienced gastroenterologist who specializes in diagnosing and treating liver disorders and digestive diseases such as colitis, Crohn’s disease, and irritable bowel syndrome (IBS). He’s also adept with endoscopic procedures, including colonoscopy and endoscopy.

After earning his medical degree at Dow Medical College in Karachi, Pakistan, Dr. Memon remained in the city to serve as the house officer in medicine and general surgery at Civil Hospital Karachi.

Dr. Memon then relocated to the United States to complete his internship in internal medicine at State University of New York (SUNY) Health Sciences Center in Syracuse, New York.

He then completed his residency in internal medicine and neurology at Wayne State University-Detroit Medical Center in Detroit, Michigan. Dr. Memon went on to do his fellowship training in gastroenterology at Henry Ford Hospital (now Henry Ford Health System) in Detroit. 

Dr. Memon is board certified in internal medicine and gastroenterology and is a fellow of the American College of Gastroenterology (FACG). 

He’s also a professional member of the American Gastroenterological Association (AGA), the American College of Gastroenterology (ACG), the American College of Physicians (ACP), and the Texas Medical Association (TMA).

Dr. Memon is fluent in English and Urdu. In his free time, he enjoys spending time with his family, reading, and socializing with friends.