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Meet Our Bariatric Team
We welcome you to read the biographies of our bariatric surgery doctors and staff. In addition to gastric sleeve, gastric bypass and gastric banding surgeons, our staff is comprised of therapists, coordinators, and nutritionists to ensure the quality of your experience.

Dr. Philip Schauer’s particular areas of expertise include laparoscopic and gastrointestinal surgery. In addition to laparoscopic surgery for obesity, Dr. Schauer also specializes in: laparoscopic anti-reflux surgery, laparoscopic esophageal surgery, laparoscopic colon resection, laparoscopic adrenalectomy and splenectomy and laparoscopic hernia repair.

He is board certified in surgery by the American Board of Surgery. He has been the principal investigator or co-investigator on many research grants and has published numerous papers, abstracts, and book chapters related to gastrointestinal and laparoscopic surgery. Memberships in professional and scientific societies include the American College of Surgeons, Society of University Surgeons, American Surgical Association, American Society for Metabolic and Bariatric Surgery, Society of American Gastrointestinal and Endoscopic Surgeons (SAGES), and Society for Surgery of the Alimentary Tract. He is past President of the American Society for Metabolic and Bariatric Surgery.

Dr. Stacy Brethauer is a staff surgeon at the Cleveland Clinic with special interests in laparoscopic bariatric surgery, foregut and gastrointestinal surgery, hernia repair, and endoscopic procedures. He received his medical degree from the Uniformed Services University of the Health Sciences School of Medicine in 1993 while on active duty in the U.S. Navy. He completed his general surgery residency training at the Naval Medical Center San Diego in 2001. He received his specialty training in Advanced Laparoscopic and Bariatric Surgery at the Cleveland Clinic and joined the staff in 2007.

Dr. Brethauer is board certified by the American Board of Surgery and is a Fellow of the American College of Surgeons. He is a member of the American Society for Metabolic and Bariatric Surgery and the Society of American Gastrointestinal and Endoscopic Surgeons. He is actively involved in many of the research projects being conducted at the Bariatric and Metabolic Institute, has published many abstracts, journal articles, and book chapters on bariatric surgery and is co-editor of a textbook on minimally invasive bariatric surgery.

Tomasz Rogula, MD, PhD, is a Staff Surgeon at the Bariatric and Metabolic Institute at the Cleveland Clinic. He was trained in weight loss surgery in the United States (Mount Sinai School of Medicine – New York, University of Pittsburgh, PA), in Italy and France. In addition to bariatric surgery, his specialty interests include laparoscopic and robotic surgery, gastrointestinal surgery and hernia repair. Dr. Rogula has done pioneering research on novel weight-loss surgery procedures. He also has published multiple articles and book chapters on topics of bariatric and laparoscopic surgery.

He is a member of the American Medical Association, Society of American Gastrointestinal and Endoscopic Surgeons, American Society of Metabolic and Bariatric Surgery, International Federation for the Surgery of Obesity and European Association for Endosopic Surgery.

Matthew Kroh, MD  joined the staff after completing a General Surgery residency and a fellowship in Advanced Laparoscopic Surgery and Surgical Endoscopy at the Cleveland Clinic. Dr. Kroh holds positions with the Bariatric and Metabolic Institute and the Center for Surgical Innovation, Technology, and Education. He is licensed by the State Medical Board of Ohio and board-certified by the American Board of Surgery. His specialty interests include advanced laparoscopic surgery, bariatric surgery, gastrointestinal surgery, surgical endoscopy, and single incision laparoscopic surgery.

After earning a Bachelor of Science degree in biology from Boston College and Master’s degree from Boston University, Dr. Kroh received his medical degree from the Mount Sinai School of Medicine of New York University. Dr. Kroh has lectured widely on laparoscopic and bariatric surgery and related topics at medical conferences across the country and has co-authored many articles and book chapters. His professional memberships include the American College of Surgeons, the American Society for Metabolic and Bariatric Surgery, and the Society of American Gastrointestinal and Endoscopic Surgeons.

Dr. Derrick Cetin joined the staff at the Bariatric and Metabolic Institute in January of 2009. From 1995-2009 he was practicing as a Board Certified Internist at the Cleveland Clinic Westlake Family Health Center. He joined the Cleveland Clinic and was accepted by the Board of Governors in 1995. Previously he was in private practice from 1989-1995. He completed an AOA Rotating Internship in Erie, PA in 1985-1986 and completed an Internship/Residency at Cleveland Metropolitan General Hospital after graduating from Philadelphia College of Osteopathic Medicine in 1985.
Primary interests include medical and surgical management of obesity and the medical management of diabetes, insulin resistance, and prediabetes. Also, certified in the management and supervision of a low calorie diet called the Protein Sparing Modified Fasting Sparing Diet.         
 Now that you have learned more about our Ohio Bariatric Team, please
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Bariatric and Metabolic Institute Team

Sherelle Tucker, Program Administrator
Shirley Littlejohn, Manager PSR

Lydia Franklin, Medical Secretary
Sharon Moten, Medical Secretary
Margaret Von Koschembahr, Medical Secretary
Cynthia Wright, Medical Secretary
Pamela Schmitz, Patient Service Rep
Matthew Sedivy, Surgical Scheduling Coordinator
Angela Shaw-Welch, Patient Service Rep
Diane Thomas, Surgical Scheduling Coordinator>
Anne Tyson-Sabir, Department Assistant

Marguarite Stephanopoulos, Events Coordinator

Debra Cash, Financial Counselor
Tammy Hall, Financial Counselor

Ingrid Muir, RN, BSN, MBA Nursing Director
Steve Booth, RN, Nurse Manager

Beth Janssen, RN, CBN Department Assistant
Toni Housiaux, RN, Department Assistant
Jennifer Mackey, RN, Department Assistant
Tammy Wade, LPN, Patient Care Coordinator

Cynthia Dragonette, Medical Assistant
Nancy Duelley, RN, Procedure Nurse
Anthony Ehlinger, RN, Clinical Coordinator
Janet Lenin, RN, Procedure Nurse

John Pavlik, Medical Assistant
Tracie Reed, Medical Assistant

Eric Ahnfeldt, DO, Bariatric Clinical Fellow
Abdulrahim Al-Awashez, MD, Bariatric Clinical Fellow
Monica Dua, MD, Bariatric Clinical Fellow
Mohammad Jamal, MD, Bariatric Clinical Fellow
Hideharu Shimizu, MD, Bariatric Clinical Fellow

Leslie Heinberg, PhD, M.A. Psychology, Director of Behavioral Health
Kathleen Ashton, PhD, Psychology
Julie Merrill, PhD, Psychology
Megan Lavery, PhD, Psychology Fellow

Wendy Kirby, RD, LD, Nutrition Therapy
Lauren Sullivan, RD, LD, Nutrition Therapy

Josephine Chan, Research Administrator
Janice Bell, Research Assistant
Chytaine Hall, Clinical Research Assistant
Lisa Johnson, Research Assistant

Randy Scott, Database

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Awards and Accolades

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