David M. Parker, MD, FACS, FASMBS, is a board-certified general surgeon specializing in bariatric surgery for both adolescents and adults. Dr. Parker performs several advanced and specialized surgical procedures, including gastric bypass, biliopancreatic diversion with duodenal switch, revisional bariatric surgery, laparoscopic gastric band (or “lap band”) and gastric sleeve. He also provides care for various conditions affecting the stomach and gastrointestinal (GI) system, including hiatal hernia, paraesophageal hernia, achalasia and acid reflux.|He has a clinical interest in minimally invasive laparoscopic and robotic surgery.|Board-certified in general surgery, Dr. Parker earned his medical degree from West Virginia University in Morgantown. He completed a general surgery residency at the Dwight D. Eisenhower Army Medical Center in Fort Gordon, GA, followed by a fellowship in bariatric and foregut surgery at Geisinger Medical Center in Danville.|While in medical school, he received the Presidential Award for Excellence in Scholarship. During his fellowship, he received the SAGES Award for best fellow presentation.|Dr. Parker serves as program director for the Geisinger bariatric and foregut surgical fellowship. He has a strong commitment to research in bariatric and foregut surgery and has authored more than 24 published articles.|He is an active member of the Society of Gastrointestinal and Endoscopic Surgeons and a fellow of the American College of Surgeons and American Society of Metabolic and Bariatric Surgeons.|Dr. Parker has served in the United States Army and continues to serve as a lieutenant colonel in the United States Army Reserve. He is also a football enthusiast, rooting for the West Virginia Mountaineers in his free time. Dr. Parker is rated as an Elite provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Hiatal Hernia, Hernia, Obesity, Gastric Bypass, and Endoscopy.

Jon Gabrielsen is a General Surgeon in Lewisburg, Pennsylvania. Dr. Gabrielsen is rated as a Distinguished provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Hiatal Hernia, Hernia, Achalasia, Gastric Bypass, and Gallbladder Removal.

Anthony T. Petrick, MD, FACS, FASMBS, is a board-certified general surgeon specializing in esophageal and bariatric surgery. Dr. Petrick performs a number of advanced and specialized surgical procedures including advanced endoscopy, revisional bariatric surgery, laparoscopic gastric band (or “lap band”), gastric bypass, biliopancreatic diversion with duodenal switch and gastric sleeve. He also treats people for various conditions affecting the stomach and gastrointestinal (GI) system, including hiatal and paraesophageal hernia, achalasia and acid reflux (GERD).|Board-certified in general surgery, Dr. Petrick earned his medical degree from Georgetown University in Washington, D.C. He completed general surgery residency at Georgetown University Medical Center in Washington, D.C. He then completed a fellowships in Surgical Oncology at and Beth Israel Deaconess Medical Center in Boston and in Bariatric and Foregut surgery at the University of Pittsburgh Medical Center.|For the past 18 years, Dr. Petrick served as program director for the Geisinger bariatric and foregut surgical fellowship. He now serves as associate program director, acting as a mentor to bariatric surgery fellows. Dr. Petrick has a strong commitment to research in bariatric and foregut surgery and has authored more than 100 articles. Currently, he serves as chief quality officer for inpatient services at Geisinger and Director of the Division of Bariatric and Foregut surgery.|Dr. Petrick is an active member of the Society of Gastrointestinal and Endoscopic Surgeons and a fellow of the American College of Surgeons and American Society of Metabolic and Bariatric Surgeons. He chairs to Data and Quality Committee for the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program and also serves as an editorial board member for the journal Surgical and Obesity-Related Diseases and a columnist for Bariatric Times.|In his free time, Dr. Petrick serves on the board of education at St. Joseph School in Danville. He also coaches the Susquehanna Valley Stampede varsity and junior varsity ice hockey teams.|Clinical Focus: Bariatric Surgery|If you’re a provider who’d like to refer a patient, call our 24/7 referral line at 800-332-8901 or visit www.emr-link.com. Dr. Petrick is rated as a Distinguished provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Obesity, Hiatal Hernia, Hernia, Gastric Bypass, and Endoscopy.

Dr. Diehl is a board-certified and fellowship-trained gastroenterologist. His clinical interests include endoscopic ultrasound, endoscopic retrograde cholangiopancreatography (ERCP) and innovative advanced therapeutic endoscopy. Dr. Diehl obtained his medical degree from the University of California, Los Angeles. He completed his residency at Harbor-UCLA Medical Center and his fellowships in gastroenterology at the University of California, San Francisco Medical Center and the University of California, Los Angeles Medical Center. Dr. Diehl is certified by the American Board of Internal Medicine. In his free time, Dr. Diehl enjoys spending time with his family and exercising, particularly swimming. He also has an appreciation for old cars. Dr. Diehl is rated as a Distinguished provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Barrett Esophagus, Gallbladder Disease, Watermelon Stomach, Endoscopy, and Gallbladder Removal.

Harshit S. Khara, MD, is an Interventional Gastroenterologist based at Geisinger Medical Center in Danville, PA.|Dr. Khara is an Associate Professor of Medicine at the Geisinger Commonwealth School of Medicine. He serves as the Director of Endoscopy; System Director of Interventional Endoscopy, Director of Endoscopic and Translational Research; Director of the Clinical Use Evaluation Committee; and System Director of Quality & Innovation. He is also the Research Director and Core faculty for the Gastroenterology Fellowship Program, as well as the Program Director for the Advanced Therapeutic Endoscopy Fellowship Program at the Center for Advanced Therapeutic Endoscopy at Geisinger, participating in the training and mentoring of advanced endoscopy and general gastroenterology fellows. Dr. Khara is also the Director of the National Pancreas Foundation Center at Geisinger.|He is involved in multi-center clinical research and quality improvement projects. Dr. Khara's clinical and research interests are in the field of interventional endoscopic ultrasound, ERCP, Barrett’s esophagus, third space endoscopy, endoscopic treatments for GERD, interventional EndoHepatology, and bariatric interventional endoscopy.|Dr. Khara earned his medical degree from Seth G.S. Medical College & K.E.M. Hospital in India then completed his Internal Medicine Residency at Drexel University College of Medicine-Saint Peter's University Hospital. He completed a Fellowship in Transplant Hepatology at the University of Nebraska Medical Center, a Fellowship in Gastroenterology at Yale University School of Medicine-Norwalk Hospital and a Fellowship in Advanced Therapeutic Endoscopy at Geisinger Medical Center.|Dr. Khara is certified in Gastroenterology by the American Board of Internal Medicine. Dr. Khara is rated as a Distinguished provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Pancreatic Pseudocyst, Gastroesophageal Reflux Disease (GERD), Barrett Esophagus, Endoscopy, and Gastric Bypass.

Christopher Motto is a General Surgeon and a Bariatric Medicine provider in Lewisburg, Pennsylvania. Dr. Motto is rated as an Experienced provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Familial Colorectal Cancer, Hernia, Gallbladder Disease, Hernia Surgery, and Pacemaker Implantation.

Gregory Enders is a Gastroenterologist in Lewisburg, Pennsylvania. Dr. Enders is rated as an Experienced provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Viral Gastroenteritis, Chronic Erosive Gastritis, Colitis, Colonoscopy, and Gastrectomy.

Vladimir Petorak is a Gastroenterologist in Lewisburg, Pennsylvania. Dr. Petorak is rated as an Experienced provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Crohn's Disease, Colorectal Cancer, Familial Colorectal Cancer, Gastrectomy, and Endoscopy.

Joseph Gallagher is a Gastroenterologist in Lewisburg, Pennsylvania. Dr. Gallagher is rated as an Experienced provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Familial Adenomatous Polyposis, Turcot Syndrome, Gardner Syndrome, Colonoscopy, and Endoscopy.

Joseph Mucciolo is a General Surgeon in Lewisburg, Pennsylvania. Dr. Mucciolo is rated as an Experienced provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Hernia, Umbilical Hernia, Gallbladder Disease, Bladder Reconstruction, and Colostomy.

Vladan Obradovic, MD, is a general surgeon specializing in bariatric surgery. Dr. Obradovic performs a number of advanced and specialized weight loss surgery procedures, including biliopancreatic diversion with duodenal switch, advanced endoscopy, revisional bariatric surgery, foregut surgery, laparoscopic gastric band (or “lap band”), gastric bypass and gastric sleeve.|Dr. Obradovic has a clinical interest in minimally invasive and robotic surgery.|Dr. Obradovic earned his medical degree from the University of Belgrade School of Medicine in Belgrade, Serbia. He completed residencies in general surgery at the Belgrade School of Medicine, and Health Centre Krusevac in Krusevac, Serbia, and digestive system and hepatobiliary surgery at the University Clinical Center of Belgrade. He then completed general surgery residency and fellowship in bariatric surgery at Geisinger Medical Center in Danville and a certification in robotic assisted surgery at Intuitive Surgical Headquarters in Sunnyvale, CA.|A resident of Danville, Dr. Obradovic is committed to serving his community by giving the best care he possibly can. He was inspired to pursue a career in medicine by his father, who was a physician.|In his spare time, he enjoys spending time with his family and friends and walking his dog. Dr. Obradovic is rated as an Advanced provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Hiatal Hernia, Obesity, Hernia, Gastric Bypass, and Endoscopy.

Dr. Shellenberger is a board-certified and fellowship-trained gastroenterologist. His clinical interests include postgraduate medical education, esophageal motility and other GI laboratory procedures. Dr. Shellenberger earned his medical degree from the Philadelphia College of Osteopathic Medicine. He completed his residency and his fellowship in gastroenterology at Geisinger Medical Center. Dr. Shellenberger is certified by the American Board of Internal Medicine in internal medicine and gastroenterology. Dr. Shellenberger is rated as an Experienced provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Crohn's Disease, Angiodysplasia of the Colon, Swallowing Difficulty, Endoscopy, and Colonoscopy.

Dr. Confer is a board-certified and fellowship-trained gastroenterologist. His clinical interests include endoscopic ultrasound and endoscopic retrograde cholangiopancreatography (ERCP). Dr. Confer attended the Lake Erie College of Osteopathic Medicine, where he received his medical degree. He completed his residency, a fellowship in gastroenterology and hepatology, and a fellowship in advanced therapeutic endoscopy at the Cleveland Clinic Foundation. Dr. Confer is certified by the American Board of Internal Medicine in gastroenterology. Dr. Confer is rated as an Experienced provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Gallbladder Disease, Benign Esophageal Stricture, Cholecystitis, Endoscopy, and Gallbladder Removal.

Danial Shaikh, MD, is an accomplished interventional gastroenterologist specializing in luminal interventions and advanced therapeutic endoscopy. He completed his medical education at Ziauddin University in Karachi, Pakistan, followed by an internal medicine residency and a gastroenterology fellowship at BronxCare Health System, Icahn School of Medicine at Mount Sinai in New York, where he also served as chief resident and chief fellow.|Dr. Shaikh further honed his skills during an advanced endoscopy fellowship at Moffitt Cancer Center, University of South Florida, and later at the Mayo Clinic in Arizona, where he focused on third space endoscopy. His board certifications include gastroenterology and internal medicine.|Fluent in both English and Urdu, Dr. Shaikh has clinical and research interests primarily in third space endoscopy and gastrointestinal oncology. His dedication to advancing the field of endoscopy through patient care, research and education has established him as a respected figure in his specialty. Dr. Shaikh is rated as an Experienced provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Toxic Megacolon, Saddle Pulmonary Embolism, Ascites, Endoscopy, and Colonoscopy.

Henry Yavorek is a General Surgeon in Selinsgrove, Pennsylvania. Dr. Yavorek is rated as an Experienced provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Hernia, Diverticular Disease, Hiatal Hernia, Congenital Diaphragmatic Hernia, and Endoscopy.

Osama Shaheen, MD, is a general surgeon specializing in bariatric and foregut surgery. He performs a variety of surgical treatments for adults, including Nissen/Toupet fundoplication, Heller myotomy, laparoscopic hiatal hernia repair, LINX procedure, Roux-en-Y gastric bypass (RYGB), gastric sleeve, duodenal switch, single anastomosis duodeno–ileal bypass with sleeve gastrectomy, (SADI-S) and revisional bariatric surgery.|Dr. Shaheen attended Damascus University in Damascus, Syria, where he earned his medical degree. After medical school, he completed a residency at Damascus University Hospital. He followed that with a fellowship in multi-organ abdominal transplant surgery and a residency in general surgery, both at Thomas Jefferson University Hospital in Philadelphia. He also completed a fellowship in bariatric and advanced minimally invasive surgery with the Advanced Laparoscopic Surgery Associates (ALSA) Medical Group in Fresno, California.|He’s received several Excellence in Teaching Awards during his residency and fellowships.|He and his wife Latifa moved to the area in 2023. “I decided to move to Geisinger, a healthcare system known for its superior quality,” he notes. Dr. Shaheen is rated as an Experienced provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Short Bowel Syndrome, Malnutrition, Obesity, Gastrectomy, and Gastric Bypass.

Harini Rathinamanickam is a Transplant Surgeon and a Gastroenterologist in Danville, Pennsylvania. Dr. Rathinamanickam is rated as an Experienced provider by MediFind in the treatment of Hiatal Hernia. Her top areas of expertise are Visceromegaly, Non-Alcoholic Fatty Liver Disease, Gardner Syndrome, Endoscopy, and Colonoscopy. Dr. Rathinamanickam is currently accepting new patients.

Arash Rahimi-Ardabily is a General Surgeon in Danville, Pennsylvania. Dr. Rahimi-Ardabily is rated as an Experienced provider by MediFind in the treatment of Hiatal Hernia. His top areas of expertise are Hiatal Hernia, Gastrointestinal Stromal Tumor, Diaphragmatic Hernia, Pancreaticoduodenectomy, and Gastric Bypass.