Family Medicine

Donald Briscoe, MD

Dr. Donald Briscoe is the program director of The Methodist (Houston) Family Medicine Residency. He is also chairman of the Department of Family Medicine, as well as the medical director of Vecino Health Centers. He completed both his undergraduate degree and medical degree at the University of Virginia and completed his family medicine residency training at the Shadyside Hospital Residency Program in Pittsburgh. He has completed an academic family medicine fellowship at the Eastern Virginia Medical School in Norfolk, Virginia, and the National Institute for Program Director Development fellowship program. Briscoe worked in a group family medical practice in the suburbs of Richmond, Virginia, prior to joining the residency faculty. Among other academic activities, Briscoe has been the author or co-author of several books, including Case Files: Family Medicine and Lange Q&A: USMLE Step 3. Briscoe is a member of the American Academy of Family Physicians, the Association of Family Medicine Residency Directors and the Society of Teachers of Family Medicine. He holds the academic position of Clinical Associate Professor of Family Medicine in Medicine at the Weill Medical College of Cornell University.

Erika Robinson
Clerkship Assistant

For more information about the family medicine clerkship, contact Clerkship Coordinator Melissa Roschal.

Internal Medicine

Christopher Peckins, MD

J. Marietta Clewing, MD

Dr. J. Marietta Clewing is a board-certified internist who joined the Department of Medicine in 2009 as an Instructor in Clinical Medicine. She currently serves as the medical student clerkship director. Clewing received her medical degree from the Freie Universität in Berlin, Germany, and completed the residency program in internal medicine at Jacobi-Einstein College of Medicine in the Bronx, New York. At graduation, she received the Ambulatory Care Resident of the Year Award. Clewing has a strong interest in medical education and is working as an attending physician on the University Teaching Service. She is a member of the Residency Evaluation Committee and the Resident Mentorship Program. Throughout her career, Clewing had a strong interest in clinical and experimental research resulting in various publications and national and international presentations. Prior to entering her residency program, Clewing held a research appointment in genetics at Baylor College of Medicine. Clewing received the General Internal Medicine Teaching Award as well as the Junior Clinical Instructor Award for 2010-2011. She was awarded the Junior Clinical Instructor Award again for 2011-2012.

Michelle Henderson
Clerkship Assistant

Lisa Caputo
Clerkship Assistant

For more information about the internal medicine clerkship, contact Clerkship Coordinator, Ashley Mozey.


Konrad Harms, MD
Clerkship Director

Dr. Konrad Harms completed his residency training in obstetrics and gynecology at the Christus St. Joseph Hospital in Houston, where he earned numerous honors including Highest CREOG Exam Score in 2000, 2001 and 2002. He continued to garner numerous honors after joining the attending staff there in 2002, including CREOG Educational Faculty of the Year (2003), Christus St. Joseph OB-GYN Residency Faculty of the Year (2005), and Best Teacher in Obstetrics and Gynecology for The Methodist Hospital OB-GYN Residency Program (2007, 2009). Harms joined the attending staff at Methodist in 2006. He has chaired the Department of OB-GYN at St. Joseph Medical Center since January of 2009.

Linda Swagger
Clerkship Assistant

For more information about the OB-GYN clerkship, contact Clerkship Coordinator Vanessa Yocouby.


Caroline Marcus, MD

Richard Byrd, MD

Dr. Richard Byrd is the chief of pediatrics at Kelsey-Seybold Clinic. Byrd received both his undergraduate degree in pre-medicine and his medical degree from Texas A & M University and completed his internship and residency at Scott and White Hospital in Temple, Texas.  Byrd is a member of the American Medical Association, American Academy of Pediatrics, Texas Pediatric Society, Harris County Medical Society and the Houston Pediatric Society.

For more information about the pediatrics clerkship, contact Clerkship Coordinator Melissa Roschal.


Ranjit Chacko, MD
Clerkship Director

Dr. Ranjit Chacko cares for patients on the Houston Methodist Hospital inpatient psychiatric unit and provides consultations throughout the hospital. His clinical interests include acute management of patients with mood, anxiety, thought and/or substance use disorders. He has additional interest in treating patients with mental health concerns, including depression, anxiety, delirium and substance use issues in the context of a wide range of other medical illnesses. Chacko graduated from the University of Colombo, Facility of Medicine, Colombo, Sri Lanka in 1971. He works in Houston and specializes in psychiatry and geriatric psychiatry. Chacko is affiliated with Houston Methodist Hospital.

Ivonne Montemar
Clerkship Assistant

For more information about the psychiatry clerkship, contact Clerkship Coordinator Ruth Sanchez.


Vadim Sherman, MD, FACS, FRCSC
Clerkship Director

Dr. Vadim Sherman is a Board Certified General Surgeon. He is also a Fellow of the American College of Surgeons and a Fellow of the Royal College of Surgeons of Canada. His undergraduate studies were in honors physiology at the University of Alberta. He completed medical school at the University of Western Ontario. Sherman performed his general surgery training at McGill University. During his training, he also earned a Master of Science from McGill University. He completed a one-year fellowship in advanced minimally invasive and bariatric surgery at the Cleveland Clinic. Sherman is actively involved in a number of surgical societies including the Society of American Gastrointestinal and Endoscopic Surgeons (SAGES), American Society for Metabolic and Bariatric Surgery (ASMBS) and the American College of Surgeons (ACS). He has trained medical students, surgical residents, fellows and surgeons in advanced minimally invasive and bariatric techniques. He has authored a number of peer-reviewed articles, book chapters and surgical videos. He has also lectured nationally and internationally on the topic of surgical weight management. His research interests are in bariatric surgery, surgical education and advanced minimally invasive surgical outcomes. Sherman's clinical expertise is minimally invasive gastro-intestinal surgery, with the primary focus being bariatric surgery. He performs surgery for reflux disease, hernia repair and other intestinal diseases. Sherman is committed to providing patients with comprehensive care and advanced surgical solutions at the highest standard of excellence.

Mia Nellums
Clerkship Assistant

For more information about the general surgery clerkship, contact Clerkship Coordinator Elizabeth Stacker.