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I am board certified in Internal Medicine and Gastroenterology. In my free time, I enjoy being outdoors in Fresno’s Mediterranean climate, and playing basketball. I can be spotted in the farmer’s market and am a big supporter of local economy. I also love reading books and being up-to-date on world affairs in addition to spending time with my wife, son and daughters

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.

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 a holistic approach to patient health. He 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.

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. 

Dr. Abdullah graduated from Damascus University School of Medicine in 1989. Certified with the American Board of Pediatric Gastroenterology and the American Board of Pediatrics since 1995, Dr. Abdullah served his residency in the Medical College of Ohio, and his fellowship in Riley Children’s Hospital and the Indiana University School of Medicine. Dr. Abdullah has provided care to South Puget Sound families since 1998.

Dr. Nieves was born and raised in Puerto Rico where she graduated Magna Cum Laude from the University of Puerto Rico Medical Sciences Campus.  She proceeded to complete her Internal Medicine residency at New York Presbyterian Hospital- Cornell in New York City, followed by a Gastroenterology fellowship at Lahey Hospital and Medical Center in Massachusetts.  Dr. Nieves specializes in general gastroenterology and some of her interests include inflammatory bowel disease and irritable bowel syndrome. 

Dr. Nieves is board certified in both Internal Medicine and Gastroenterology.  She is fluent in both English and Spanish and strives to develop and maintain good relationships with her patients.  She loves spending her free time traveling and enjoying the outdoors with her husband and 2 children.

Dr. Allen attended medical school at UNC and performed his Gastroenterology Fellowship at the Medical College of Virginia where he also served as Chief Fellow and completed a sub fellowship in Pancreatobiliary Medicine.  He is Board Certified in both Internal Medicine and Gastroenterology.  He originally joined Raleigh Medical Group in 1991.  He and his wife, Dr. Jill Allen, who are both from very rural areas, moved to the country in Southern Virginia to slow down some, raise a family along the shores of Kerr Lake, and devote themselves to the practice of their specialties in very underserved areas.  Dr. Allen closed his practice after 21 years of service and has rejoined his friends, both old and new, at Raleigh Medical Group.  And he admits, he is having a blast!  

Dr. Allen has won Clinician of the Year Awards from both UNC and Duke University Medical Center.  He won the Presidents Award from the Virginia GI Society for his work in converting the ACG Williamsburg Conference from a local speakers’ conference to the third largest academic GI conference in America.  He very much enjoys teaching at both the medical student and community levels.

In his free time, Dr. Allen enjoys spending time with his family and church.  He and his wife are active members of Clarksville Presbyterian Church.

Dr. Allen attended medical school at UNC and performed his Gastroenterology Fellowship at the Medical College of Virginia where he also served as Chief Fellow and completed a sub fellowship in Pancreatobiliary Medicine.  He is Board Certified in both Internal Medicine and Gastroenterology.  He originally joined Raleigh Medical Group in 1991.  He and his wife, Dr. Jill Allen, who are both from very rural areas, moved to the country in Southern Virginia to slow down some, raise a family along the shores of Kerr Lake, and devote themselves to the practice of their specialties in very underserved areas.  Dr. Allen closed his practice after 21 years of service and has rejoined his friends, both old and new, at Raleigh Medical Group.  And he admits, he is having a blast!  

Dr. Allen has won Clinician of the Year Awards from both UNC and Duke University Medical Center.  He won the Presidents Award from the Virginia GI Society for his work in converting the ACG Williamsburg Conference from a local speakers’ conference to the third largest academic GI conference in America.  He very much enjoys teaching at both the medical student and community levels.

In his free time, Dr. Allen enjoys spending time with his family and church.  He and his wife are active members of Clarksville Presbyterian Church.

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.

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.

Samuel Cho, MD, is a board-certified gastroenterologist at his New York City practice in Flushing, Queens. With over 15 years of practice experience, Dr. Cho is a leading physician who specializes in preventing and treating digestive diseases as well as offering comprehensive patient care.

Dr. Cho graduated with honors from Williams College in Williamstown, Massachusetts, and received his medical degree from The New York University School of Medicine. He then finished both an internal medicine residency and a gastroenterology fellowship training at NYU Langone Medical Center.  He and his experienced team identify and act on disease risk factors to keep patients healthy. Dr. Cho offers the safest, most effective, personalized treatment plans.

He and his staff perform a wide array of endoscopy and colonoscopy procedures in his Flushing office using advanced techniques in a comfortable, convenient setting. He’s committed to making a meaningful, positive difference in patient health, longevity, and overall wellbeing.

Patients seeking relief or treatment for colorectal cancer, Crohn's disease, gastroesophageal reflux disease (GERD), indigestion, irritable bowel syndrome (IBS), ulcers, stomach flu, and more can turn to Dr. Cho and his gastroenterology team for the quality care they deserve.

He maintains his advanced credentials and stays up-to-date with the latest advances in gastrointestinal medicine. Dr. Cho is board-certified in internal medicine and gastroenterology and is considered a top physician in New York City. He attracts patients internationally, particularly VIP patients from Korea.

Dr. Cho and his team look forward to welcoming new patients to the practice. To learn more about the medical services available at Samuel Cho, MD, PC, schedule an appointment by phone or online today.

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 - 2024), and named to the prestigious Castle-Connolly America’s Top Doctors® directory (2015 -2024).    

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 - 2024), and named to the prestigious Castle-Connolly America’s Top Doctors® directory (2015 -2024).    

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

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 in the Park 55 Building 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 serves as the director of the GI motility unit at Lenox Hill Hospital.

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

Lourdes González Bahamonde, DO, is a fellowship-trained gastroenterologist, board certified in internal medicine and medical ethics, providing comprehensive medical care at Center For Digestive Healing in the San Gabriel Valley, and Los Angeles California. She earned a bachelor's degree in psychobiology at UCLA, and a master's in bio-physiology at CSULA before earning her medical degree at New York College of Osteopathic Medicine, NYIT on Long Island. She completed her ACGME training in internal medicine, gastroenterology, hepatology, and nutrition at North Shore University Hospital and Long Island Jewish Medical Center in New York in 2013.

The Center For Digestive Healing was established as an sCorp in 2018. It is fully equipped with the latest diagnostic technologies. She offers comprehensive care through a telemedicine platform, assisting patients from wherever they are. While Dr. Bahamonde specializes in digestive disorders, her practice has evolved toward integrative, preventive, patient-centered care that combines learned principles in internal medicine and GI with osteopathic manipulative medicine in practice.

Over the four years since relocating from NY, she has performed over 7,500 gastric and colorectal cancer screening endoscopies with polypectomies and mucosal resections, as well as advanced disease screenings for chronic liver disease. Dr. Bahamonde emphasizes peer-reviewed understanding of the interrelationship of body, structure, and function, allowing her special insight into treating gut-brain disorders. She has dedicated her life to serving diverse communities through education and cultural competence, recognizing the importance of open communication in shared-decision making.

Dr. Bahamonde continues to inspire future health care leaders as volunteer faculty in clinical medicine, medical ethics, and clinical research. She is dedicated to translational science efforts for youth in STEM programs and students in pre-health professions.

Lourdes González Bahamonde, DO, is a fellowship-trained gastroenterologist, board certified in internal medicine and medical ethics, providing comprehensive medical care at Center For Digestive Healing in the San Gabriel Valley, and Los Angeles California. She earned a bachelor's degree in psychobiology at UCLA, and a master's in bio-physiology at CSULA before earning her medical degree at New York College of Osteopathic Medicine, NYIT on Long Island. She completed her ACGME training in internal medicine, gastroenterology, hepatology, and nutrition at North Shore University Hospital and Long Island Jewish Medical Center in New York in 2013.

The Center For Digestive Healing was established as an sCorp in 2018. It is fully equipped with the latest diagnostic technologies. She offers comprehensive care through a telemedicine platform, assisting patients from wherever they are. While Dr. Bahamonde specializes in digestive disorders, her practice has evolved toward integrative, preventive, patient-centered care that combines learned principles in internal medicine and GI with osteopathic manipulative medicine in practice.

Over the four years since relocating from NY, she has performed over 7,500 gastric and colorectal cancer screening endoscopies with polypectomies and mucosal resections, as well as advanced disease screenings for chronic liver disease. Dr. Bahamonde emphasizes peer-reviewed understanding of the interrelationship of body, structure, and function, allowing her special insight into treating gut-brain disorders. She has dedicated her life to serving diverse communities through education and cultural competence, recognizing the importance of open communication in shared-decision making.

Dr. Bahamonde continues to inspire future health care leaders as volunteer faculty in clinical medicine, medical ethics, and clinical research. She is dedicated to translational science efforts for youth in STEM programs and students in pre-health professions.