John Christoforetti is a Sports Medicine specialist and an Orthopedics provider in Bethesda, Maryland. Dr. Christoforetti is rated as an Advanced provider by MediFind in Endoscopy. His top areas of expertise are Beukes Familial Hip Dysplasia, Bursitis, Tendinitis, Endoscopy, and Tenotomy. Dr. Christoforetti is currently accepting new patients.

Nikiya Asamoah-Clark is a Gastroenterologist in Washington, Washington, D.c.. Dr. Asamoah-Clark is rated as an Experienced provider by MediFind in Endoscopy. Her top areas of expertise are Ulcerative Colitis, Crohn's Disease, Familial Adenomatous Polyposis, Endoscopy, and Gastrectomy.

Wei Xu is a Holistic Medicine provider in Washington, Washington, D.c.. Ms. Xu is rated as a Distinguished provider by MediFind in Endoscopy. Her top areas of expertise are Small Lymphocytic Lymphoma (SLL), T-Cell Lymphoma, Upper Tract Urothelial Carcinoma (UTUC), Nephrectomy, and Endoscopy.

Margaret “Geri” Keane is a gastroenterologist specializing in Therapeutic and Bariatric endoscopy. She primarily treats people who require assistance with weight loss or who have weight regain or a complication following Bariatric Surgery. She offers the full range of minimally invasive endoscopic approaches to weight loss, including endoscopic sleeve gastroplasty, the gastric balloon procedure or transoral gastric outlet reduction. She also sees patients who have biliary complaints such as bile duct stones or strictures, cancers of the bile duct or and diseases of the pancreas such as pancreatic cysts, to name a few. She performs all forms of therapeutic EUS and ERCP including cholangioscopy. Dr. Keane earned her medical degree at Guy’s, King’s and St Thomas’ Medical school in London. She completed her internal medicine residency at The Hammersmith and Charing Cross hospitals in London, followed by a fellowship in gastroenterology and hepatology at University College London Hospitals, the Royal Free Hospital and King’s College Hospital in London. During her gastroenterology fellowship, Dr. Keane undertook a master’s degree in medical education and a Ph.D. at University College London. Her doctorate explored novel diagnostic and therapeutic strategies for the management of pancreatic cysts. Following her gastroenterology fellowship, Dr. Keane completed a fellowship in hepatology and endoscopic retrograde cholangiopancreatography/endoscopic ultrasound at King’s College London, followed by a two-year advanced endoscopy fellowship at Johns Hopkins. She is certified in general internal medicine, gastroenterology and hepatology by the Joint Royal Colleges of Physicians Training Board of the United Kingdom. She is a member of the Royal College of Physicians of the United Kingdom and is a fellow of the Higher Education Academy. She is a recipient of the American Society for Gastrointestinal Endoscopy 2022 Endoscopic Training Award, which enabled her to gain dedicated training in bariatric endoscopy at Mohak bariatric center in Indore, India, one of the busiest bariatric centers in the world. Dr. Keane’s research interests include Bariatric Endoscopy, Endoscopic innovation and early diagnostic strategies for pancreatic and biliary tract cancers including the management of pancreatic cysts. She has published more than 70 original articles, editorials, book chapters and review articles. Dr. Keane is rated as an Advanced provider by MediFind in Endoscopy. Her top areas of expertise are Bile Duct Obstruction, Pancreatic Cancer, Gallbladder Disease, Endoscopy, and Hepato-Pancreato-Biliary Surgery.

Reginald Gohh is a Nephrologist in Washington, Washington, D.c.. Dr. Gohh is rated as an Experienced provider by MediFind in Endoscopy. His top areas of expertise are Chronic Kidney Disease, End-Stage Renal Disease (ESRD), Liddle Syndrome, Kidney Transplant, and Endoscopy.

Jing Liu is a Holistic Medicine provider in Rockville, Maryland. Ms. Liu is rated as a Distinguished provider by MediFind in Endoscopy. Her top areas of expertise are Chronic Graft Versus Host Disease (cGvHD), Menopause, Chronic Rhinosinusitis with Nasal Polyps (CRSwNP), Endoscopy, and Percutaneous Coronary Intervention (PCI). Ms. Liu is currently accepting new patients.

Jian Li is a Holistic Medicine provider in Rockville, Maryland. Ms. Li is rated as a Distinguished provider by MediFind in Endoscopy. Her top areas of expertise are Gallbladder Disease, Febrile Neutropenia, Trichinosis, Endoscopy, and Bone Graft.

Steven Holland is an Infectious Disease provider in Bethesda, Maryland. Dr. Holland is rated as an Experienced provider by MediFind in Endoscopy. His top areas of expertise are Coccidioidomycosis, Mycobacterium Avium Complex Infections, Disseminated Tuberculosis, Common Variable Immune Deficiency, and Endoscopy.

Clint Allen is an Otolaryngologist in Bethesda, Maryland. Dr. Allen is rated as an Experienced provider by MediFind in Endoscopy. His top areas of expertise are Recurrent Respiratory Papillomatosis, Head and Neck Squamous Cell Carcinoma (HNSCC), Hearing Loss, Human Papillomavirus Infection, and Endoscopy.

Dr. Andrew B. Wolff is an orthopaedic surgeon at Sibley Memorial Hospital. He practices out of Washington Orthopaedics and Sports Medicine, located in Sibley Memorial Hospital’s Medical Building and Washington, D.C. . Dr. Wolff has an internationally recognized expertise in hip arthroscopy and preservation. He lectures at both national and international meetings, as well as publishes peer-reviewed research about hip preservation procedures, best practices and how to achieve best results. He is involved with ongoing research projects as well. Dr. Wolff earned his undergraduate degree from Amherst College and his medical degree from Washington University School of Medicine. He completed a residency in orthopaedic surgery at Yale-New Haven Hospital and a fellowship in sports medicine and hip, knee and shoulder at Steadman Hawkins Clinic. Dr. Wolff is the Washington, D.C. representative of the Medicare Carrier Advisory Committee and of the Board of Councilors for the American Academy of Orthopaedic Surgeons. Previously, he has held the positions of president, vice president and treasurer of the Washington Orthopaedic Society. Dr. Wolff is a fellow of the American Academy of Orthopaedic Surgeons, as well as a member of the International Society for Hip Arthroscopy, the Arthroscopy Association of North America and the American Orthopaedic Society for Sports Medicine. He has been awarded the Associate Master Hip Arthroscopy Instructor title by the Arthroscopy Association for North American Orthopaedic Learning Center and the Outstanding Contributions to Sports Medicine Fellowship by the Uniformed Services University. Dr. Wolff is the vice-president of the Multi-Center Arthroscopic of the Hip Study Group. He has developed techniques and instrumentation that makes hip arthroscopy treatment easier, safe and more reliable. Dr. Wolff is also a consultant review of current research for the American Journal of Sports Medicine and the Journal of the American Academy of Orthopaedic Surgeons. He has contributed to numerous publications and preservations in the field, earning him the Arthroscopy Association of North America Clinical Fellow Essay Award and the Merck Manual Award “For scholastic achievement in medical studies.”. Dr. Wolff is rated as an Advanced provider by MediFind in Endoscopy. His top areas of expertise are Acute Pain, Endoscopy, and Tenotomy.

Steven Zeddun is a Gastroenterologist in Chevy Chase, Maryland. Dr. Zeddun is rated as an Advanced provider by MediFind in Endoscopy. His top areas of expertise are Achalasia, Crohn's Disease, Ulcerative Colitis, Endoscopy, and Colonoscopy.

Manish Singla, MD, specializes in gastroenterology and is board-certified by the American Board of Internal Medicine. He practices at UPMC Western Maryland Primary Care. Dr. Singla received his medical degree from George Washington University School of Medicine and Health Sciences and completed his residency at the Naval Medical Center San Diego, followed by a fellowship at National Capital Consortium — Walter Reed National Military Medical Center. Dr. Singla is rated as an Advanced provider by MediFind in Endoscopy. His top areas of expertise are Crohn's Disease, Viral Gastroenteritis, Irritable Bowel Syndrome (IBS), Endoscopy, and Colonoscopy.

Theo Heller is a Gastroenterologist in Bethesda, Maryland. Dr. Heller is rated as an Advanced provider by MediFind in Endoscopy. His top areas of expertise are Hepatitis D, Hepatitis, Portal Hypertension, Gastrectomy, and Endoscopy.

Patrick Monahan is a primary care provider, practicing in Internal Medicine in Bethesda, Maryland. Dr. Monahan is rated as an Advanced provider by MediFind in Endoscopy. His top areas of expertise are Testicular Cancer, Tinnitus, Colorectal Cancer, Colonoscopy, and Endoscopy.

Naveen Gupta is a Gastroenterologist in Bethesda, Maryland. Dr. Gupta is rated as an Advanced provider by MediFind in Endoscopy. His top areas of expertise are Gastrointestinal Bleeding, Gallstones, Choledocholithiasis, Endoscopy, and Gastrectomy.

Nyall London has a unique clinical practice focused on the care of patients with sinonasal and skull base cancers. As one of the few surgeons trained in both head and neck cancer surgery, as well as rhinology and skull base surgery, he offers patients comprehensive sinonasal tumor surgical care, including open and endoscopic approaches as well as neck dissection surgery. Dr. London has developed notable patient education events about the multidisciplinary and long-term care of patients with sinonasal malignancies. Additionally, he is an innovator of clinical trials for these rare tumors, with open clinical trial options available and multiple others in development. Internationally recognized for his expertise in the care of patients with sinonasal and skull base cancers, Dr. London was an associate editor for the first international consensus statement on sinonasal tumors, and was appointed president of the International Network for Sinonasal Cancer Research (2024–26). He directs a research laboratory at the National Cancer Institute/National Institutes of Health focused on therapeutic advances and mechanisms of sinonasal tumorigenesis. Dr. London has published more than 130 peer-reviewed research articles, reviews and book chapters, including co-first author publications in Nature, Nature Medicine, Science Translational Medicine and Nature Cell Biology. He earned his medical and doctoral degrees from the University of Utah, and completed his residency in otolaryngology–head and neck surgery at Johns Hopkins. He also accomplished a fellowship in open and endoscopic head and neck and skull base surgery at The Ohio State University, under the direction of Dr. Ricardo Carrau. Dr. London is rated as an Advanced provider by MediFind in Endoscopy. His top areas of expertise are Olfactory Neuroblastoma, Sinus Cancer, Teratocarcinosarcoma, Endoscopy, and Craniectomy.

Rajeev Pandarinath is an Orthopedics provider in Bethesda, Maryland. Dr. Pandarinath is rated as an Experienced provider by MediFind in Endoscopy. His top areas of expertise are Tendinitis, Osteoarthritis, Frozen Shoulder, Hip Replacement, and Shoulder Arthroscopy.

Olaya Gutierrez is a Gastroenterologist in Washington, Washington, D.c.. Dr. Gutierrez is rated as an Advanced provider by MediFind in Endoscopy. Her top areas of expertise are Achalasia, Gastroesophageal Reflux Disease (GERD), Choledocholithiasis, Endoscopy, and Lithotripsy.

Dr. Michail Mavros, a surgical oncologist specializing in complex cancers, is deeply committed to offering his patients personalized, advanced care. Originally from Athens, Greece, Dr. Mavros's passion for oncology was sparked during medical school after losing a close friend to cancer. This life-changing event inspired him to dedicate his career to improving the lives of cancer patients. Dr. Mavros is one of few surgeons with accredited subspecialty training in both complex surgical oncology and hepato-pancreato-biliary (HPB) surgery, making him highly qualified to treat cancers of the liver, pancreas, and bile ducts. He is also skilled in minimally invasive techniques, including laparoscopic and robotic-assisted surgery, which offer benefits such as faster recovery, reduced pain, and improved outcomes. At the heart of Dr. Mavros' approach is his belief in individualized care. He works closely with a multidisciplinary team of experts, including medical oncologists, radiation oncologists, and pathologists, to ensure each patient receives a thorough evaluation. This collaborative approach results in comprehensive, personalized treatment plans. By leveraging the latest advances in precision medicine, Dr. Mavros tailors his treatments to meet the unique needs of each patient, guided by the most current scientific research and evidence-based practices. Dr. Mavros is rated as an Experienced provider by MediFind in Endoscopy. His top areas of expertise are Familial Pancreatic Cancer, Neuroendocrine Tumor, Pancreatic Cancer, Pancreaticoduodenectomy, and Pancreatectomy.

Dr. Brett Parker is a general surgeon and fellowship-trained minimally invasive foregut and bariatric surgeon. He is an Assistant Professor of Surgery at Johns Hopkins and also the Program Director for the Johns Hopkins Advanced GI and Minimally Invasive Surgery Fellowship Program. Dr. Parker is an expert in minimally invasive surgical techniques including advanced laparoscopy and robotic surgery, as well as therapeutic flexible endoscopy. He is interested in promoting the evolving indications for surgical repair of hiatal hernias, as well as adjunct procedures surgeons can use to reduce recurrence rates. He offers a wide range of interventions for GERD, including innovative endoscopic therapies, and promotes early surgical referral to discuss and tailor therapy to individual patient circumstances. Dr. Parker also has a robust abdominal wall reconstruction and weight loss surgery practice. He is widely published on the surgical outcomes of foregut surgery, emerging technologies, and innovation, as well as surgical simulation and skills transfer. Dr. Parker has consistently been selected as a Washingtonian Magazine Top Doctor in 2023, 2024, and 2025. As a member of the Johns Hopkins Division of Minimally Invasive Surgery in the Greater Washington Area, Dr. Parker is dedicated to the best, individualized, patient outcomes. Learn more about Dr. Parker and his partners within the Johns Hopkins Division of Minimally Invasive Surgery, the Johns Hopkins Heartburn Center and the Johns Hopkins Motility and Neurogastroenterology Center. Dr. Parker is rated as an Experienced provider by MediFind in Endoscopy. His top areas of expertise are Hiatal Hernia, Hernia, Congenital Diaphragmatic Hernia, Endoscopy, and Gallbladder Removal.