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.

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.

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, Gallbladder Disease, Cholangitis, Endoscopy, and Gastric Bypass.

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.

Dr. Brian G. Johnson is the chief of interventional radiology at Sibley Memorial Hospital. Dr. Johnson practices out of Sibley Memorial Hospital in Washington, D.C., Suburban Hospital in Bethesda, MD and the Johns Hopkins Hospital in Baltimore, MD. Dr. Johnson graduated summa cum laude from University of Minnesota prior to earning his medical degree from Johns Hopkins University School of Medicine. He completed a residency in physical medicine and rehabilitation at Sinai Hospital of Baltimore, as well as a residency in diagnostic radiology at the University of Maryland Medical Center. Dr. Johnson also completed an interventional radiology fellowship at Johns Hopkins University. Dr. Johnson has been repeatedly named a Top Doctor by Washingtonian Magazine, as well as a Top MD by Consumers' Checkbook Magazine. He is a member of the American College of Radiology and the Society of Interventional Radiology. Videos Brian Johnson, M.D.Interventional Radiology Selected Publications Neuromodulatory effect of the atrial natriuretic factor clearance receptor binding peptide, cANF(4-23)-NH2 in the rabbit isolated vas deferentia, Johnson BG, Trachte GJ, Drewett JG, J Pharm & Exp Ther - 1/1/1991 Percutaneous Management of Renal and Renal-Pancreas Transplant Recipients Using CT Fluoroscopy: A Two Year Experience. Krebs TL, Johnson BG, Daly BD, Wong-You-Chong JJ, Bartlett ST, Radiological Society of North America Meeting, Chicago, IL - 1/29/1998 The hexagonal cell nitinol intravascular stent: a comparison of the effects of varying the stent wire gauge on the aorta and inferior vena cava in the swine animal model. Kuo J, Johnson BG, Venbrux AC, Olson JL, Samphilipo MA, Magee CA, Kobelja MA, Anderson JH, Osterman FA, American Roentgen Ray Society Annual Meeting, New Orleans, LA - 1/24/1994 The role of anticoagulation in the setting of a tethered vena cava filter in the swine animal model. Johnson BG, Reichle RL, Venbrux AC, Samphilipo MA, Magee CA, Anderson JH, Osterman FA, Society for Cardiovascular and Interventional Radiology Annual Meeting, Fort Lauderdale, FL - 1/1/1995. Dr. Johnson is rated as an Experienced provider by MediFind in Endoscopy. His top areas of expertise are Familial Pancreatic Cancer, Pancreatic Cancer, Bile Duct Obstruction, Vertebroplasty, and Bone Graft.

Maria Villanueva is a Geriatrics provider in Bethesda, Maryland. Dr. Villanueva is rated as an Experienced provider by MediFind in Endoscopy. Her top areas of expertise are End-Stage Renal Disease (ESRD), Sepsis, Dehydration, Endoscopy, and Gastrostomy.

Bashir Zikria is a Sports Medicine specialist and an Orthopedics provider in Bethesda, Maryland. Dr. Zikria is rated as an Experienced provider by MediFind in Endoscopy. His top areas of expertise are Osteoarthritis, Arthritis, Frozen Shoulder, Tenotomy, and Knee Replacement.

Ada Graham is a fellowship-trained colorectal surgeon in the National Capital Region, specializing in colon and rectal surgery. This includes colon cancer, rectal cancer, anal cancer, diverticulitis, crohn's disease, ulcerative colitis, as well as such diseases as hemorrhoids and anal fissures. She is passionate about working with referring physicians to provide patients with the most effective treatment option. Dr. Graham's research focuses on inflammatory bowel disease and quality improvement initiatives such as ERAS, Enhanced Recovery After Surgery. She chose colon and rectal surgery as a way to help improve people's quality of life. Dr. Graham received her undergraduate degree in linguistics from Dartmouth College, summa cum laude, and was a park ranger in New Zealand and high school teacher in Thailand all before attending medical school at the University of Tennessee Health Science Center. She completed her general surgical residency at the George Washington University in Washington, DC, and her colorectal surgery fellowship at the University of Chicago. Videos Ada Graham M.D. Dr. Graham is rated as an Experienced provider by MediFind in Endoscopy. Her top areas of expertise are Rectal Prolapse, Hemorrhoids, Colorectal Cancer, Endoscopy, and Gastrectomy.

Andrew Lerner, M.D., is a clinical instructor of medicine in the pulmonary and critical care medicine department at the Johns Hopkins University School of Medicine, as well as the director of interventional pulmonology at the Johns Hopkins Kimmel Cancer Center at Sibley Memorial Hospital. He practices out of Sibley Memorial Hospital in Washington, D.C. Dr. Lerner is part of the Sibley Memorial Hospital Lung Nodule and Lung Cancer Screening Clinic, the Multidisciplinary Pulmonary and Thoracic Surgery Clinic, and the Multidisciplinary Thoracic Tumor Board Conference. Dr. Lerner has an expertise in minimally invasive procedures for the early diagnosis and treatment of malignant and non-malignant diseases of the airways, lungs and pleura. He is experienced in advanced diagnostic and therapeutic bronchoscopy, including endobronchial ultrasound (EBUS) bronchoscopy, navigational bronchoscopy, rigid bronchoscopy, tumor ablative techniques, airway stent placement, airway dilation, radial EBUS, conventional transbronchial needle aspiration (TBNA), bronchial thermoplasty, whole lung lavage and percutaneous lung biopsy; as well as percutaneous tracheostomy, tunneled pleural catheter placement, thoracentesis, tube thoracoscopy, medical thoracoscopy, chemical pleurodesis and upper endoscopy (EGD/PEG) placement. Dr. Lerner earned his medical degree from George Washington University School of Medicine. He completed his residency in internal medicine at Thomas Jefferson University Hospital, followed by a fellowship in pulmonary and critical care medicine at the University of California, San Diego. Dr. Lerner then completed a two-year advanced fellowship in interventional pulmonology at The Johns Hopkins Hospital, including a chief fellowship year. He has been involved in multiple research projects in the field and completed a Science of Clinical Investigation Certificate Program at Johns Hopkins University Bloomberg School of Public Health. Dr. Lerner has been a member of the Alpha Omega Alpha medical honors society since 2011 and earned The Johns Hopkins Hospital Patient Safety Star Award in 2016. Dr. Lerner has contributed to numerous presentations, lectures, publications, book chapters and abstracts. He is a reviewer for several research journals. Dr. Lerner has various research interests and is currently involved in research projects focusing on EBUS bronchoscopy, lung cancer diagnosis and staging, and other topics. Confidential email to reach Dr. Lerner for any questions: alerner@jhu.edu. Dr. Lerner is rated as an Experienced provider by MediFind in Endoscopy. His top areas of expertise are Lung Nodules, Lymphofollicular Hyperplasia, Pleural Effusion, Pleurisy, and Endoscopy.

Dr. Patrick Mufarrij is a member of the Johns Hopkins Brady Urologic Institute at Sibley Memorial Hospital and is an expert in endourology, including percutaneous and endoscopic urologic surgery; metabolic stone and causes of the recurrent stone formation; and robotic surgery for the reconstruction of the urinary tract. He also serves as the Division Cheif for Urology at Sibley Memorial Hospital. Dr. Mufarrij earned his undergraduate degree and his medical degree from Georgetown University School of Medicine. He completed residencies in general surgery and urology at New York University School of Medicine, followed by special training in endourology during a fellowship at Wake Forest Baptist Medical Center. During his fellowship, Dr. Mufarrij focused on metabolic kidney stone disease, surgery for complex kidney stones, percutaneous renal surgery and robotic surgery. Dr. Mufarrij is a member of the American Urological Association. Dr. Mufarrij has contributed to numerous publications on the topics of urology. Dr. Mufarrij is rated as an Experienced provider by MediFind in Endoscopy. His top areas of expertise are Kidney Stones, Perirenal Abscess, Carbuncle, Ureteroscopy, and Lithotripsy.

Stephen R. Broderick, M.D., MPHS, is an assistant professor of surgery at Johns Hopkins University School of Medicine and a thoracic surgeon, part of a multidisciplinary team treating lung cancer patients in the Johns Hopkins Kimmel Cancer Center. Listen to Dr. Broderick's Cancer Matters podcast episode to learn more about his work. Dr. Broderick's primary clinical focus is at Sibley Memorial Hospital, in Washington, D.C. He also practices at The Johns Hopkins Hospital and Johns Hopkins Bayview Medical Center in Baltimore, Maryland. Dr. Broderick has a clinical expertise in surgical treatment of lung cancer, esophageal cancer and other thoracic malignancies, as well as benign thoracic conditions. This includes achalasia, bronchoscopy, chest wall reconstruction and tumors, lung nodules and paraesophageal hernias. He has a clinical interest in minimally invasive surgery for lung cancer and the coordinated delivery of multidisciplinary care for thoracic oncology patients. Before joining Johns Hopkins, Dr. Broderick was a thoracic surgeon at St Luke’s Hospital, where he served as the medical director of the cardiothoracic intensive care unit and a member of the oncology steering committee. He also served as an instructor of surgery at Washington University School of Medicine. Dr. Broderick received his medical degree from Georgetown University School of Medicine in 2003 and he completed his internship and residency training in general surgery at New York-Presbyterian Hospital. He studied the molecular biology of lung cancer as a research fellow at Memorial Sloan Kettering Cancer Center, where he received the Chairman's Award for outstanding contributions to the basic science research fellowship. Dr. Broderick also completed a fellowship in thoracic surgery at Washington University School of Medicine in 2012 and earned a Masters in Population Health Science from Washington University School of Medicine in 2014. Dr. Broderick is a member of the American College of Chest Physicians, The Society of Thoracic Surgeons and the American Society of Clinical Oncology. Dr. Broderick’s research interests are focused on improving outcomes for lung cancer patients. He is particularly interested in studying how various treatments for early-stage lung cancer impact patients’ quality of life. Dr. Broderick has contributed to numerous publications and is a reviewer for the Journal of Cardiovascular and Thoracic Surgery, as well as Annals of Thoracic Surgery. Dr. Broderick is rated as an Experienced provider by MediFind in Endoscopy. His top areas of expertise are Lung Cancer, Non-Small Cell Lung Cancer (NSCLC), Lung Nodules, Tubal Ligation, and Lung Transplant.

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.

Kimia Ghaznavi is a Hospital Medicine provider in Washington, Washington, D.c.. Dr. Ghaznavi is rated as an Experienced provider by MediFind in Endoscopy. Her top areas of expertise are Febrile Neutropenia, Liver Failure, Heart Failure with Preserved Ejection Fraction (HFpEF), Endoscopy, and Bone Marrow Aspiration.

Dr. Katherine Lamond is the Medical Director of the Johns Hopkins Center for Bariatrics Surgery at Sibley Memorial Hospital and Assistant Professor of Surgery for Johns Hopkins School of Medicine. She specializes in laparoscopic bariatric surgery, and performs the Roux-en-Y Gastric Bypass, Sleeve Gastrectomy and Adjustable Gastric Banding at Sibley. She is also a surgeon with Johns Hopkins Surgery at Sibley, where she practices general surgery and advanced laparoscopic surgery. Dr. Lamond grew up in Maryland and attended Dartmouth College for her undergraduate education, before moving back to the area to attend Georgetown University School of Medicine. Her internship and residency in General Surgery were completed at the University of Virginia in Charlottesville. She then completed a fellowship at Johns Hopkins Hospital in Minimally Invasive and Bariatric Surgery. More recently, Dr. Lamond served as Assistant Professor of Surgery at the University of Maryland School of Medicine from 2012-2015, prior to transitioning her practice to Sibley Memorial Hospital. She is a Fellow of the American College of Surgeons and is active in both the Society of American Gastrointestinal and Endoscopic Surgeons and the American Society for Metabolic and Bariatric Surgery. Videos Meet Katherine Lamond, M.D., Minimally Invasive Surgeon Surgical Weight Loss Options 101 GERD and Bariatric Surgery FAQ. Dr. Lamond is rated as an Experienced provider by MediFind in Endoscopy. Her top areas of expertise are Hernia, Ogilvie Syndrome, Obesity in Children, Sleeve Gastrectomy, and Gastrectomy.

Dr. Chefetz serves as Associate Chief Medical Officer and Physician Advisor for Sibley Memorial Hospital. Her areas of clinical expertise are Hospital Medicine and Internal Medicine. Dr. Chefetz is rated as an Experienced provider by MediFind in Endoscopy. Her top areas of expertise are Liver Failure, Pediatric Myocarditis, Heart Failure with Preserved Ejection Fraction (HFpEF), Colonoscopy, and Endoscopy.

Sungho Han is a Hospital Medicine provider in Washington, Washington, D.c.. Dr. Han is rated as an Experienced provider by MediFind in Endoscopy. His top areas of expertise are Pacemaker Implantation and Endoscopy.

Antoinette Saddler, M.D., is a fellowship-trained gastroenterologist specializing in general gastroenterology and management of patients with mild to severe malnutrition. She has experience in treating complex gastrointestinal disorders including short bowel syndrome, celiac disease, inflammatory bowel disease, irritable bowel syndrome, gastrointestinal malignancies, gastrointestinal tract dysmotility and high-output ostomies, as well as the malnutrition associated with these conditions. Dr. Saddler has held positions at the University of Kentucky, MedStar Washington Hospital Center, the University of Virginia School of Medicine, and the George Washington University School of Medicine and Health Sciences. She has also been a private practice gastroenterologist. Her professional activities include regional and national lectures on the management of gastrointestinal disorders associated with malnutrition. She previously served as the director of medical nutrition at the University of Virginia Digestive Health Center, where patients with complex gastrointestinal and nutritional disorders receive care. Dr. Saddler obtained her medical degree at the Case Western Reserve University School of Medicine. She completed her residency training in internal medicine at New York-Presbyterian/Weill Cornell Medical Center followed by fellowship training in gastroenterology at Memorial Sloan Kettering Cancer Center. She pursued additional fellowship training there in clinical nutrition. Dr. Saddler is rated as an Experienced provider by MediFind in Endoscopy. Her top areas of expertise are Gastroparesis, Chronic Erosive Gastritis, Familial Adenomatous Polyposis, Endoscopy, and Gastrectomy.

Nadia Sirdar is a Hospital Medicine provider in Washington, Washington, D.c.. Dr. Sirdar is rated as an Experienced provider by MediFind in Endoscopy. Her top areas of expertise are Febrile Neutropenia, Endoscopy, and Gastrostomy.