Winston_05John H. Winston, III, M.D. brings many years of extensive experience to the San Antonio region and the Colorectal Surgery Services, PLLC.

Dr. Winston received an engineering degree from the University of Alabama then received his medical degree from the University of Alabama School of Medicine. He completed his residencies in General Surgery & Colorectal Surgery at the Washington Hospital Center in Washington, DC receiving diverse training in all aspects of surgery of the colon, rectum & anus. After completing his training, he held academic positions at the Ohio State University then the University of Texas HSC at San Antonio.

Dr. John Winston’s surgical & research interests include defecatory physiology, anorectal ultrasound, benign anal diseases, rectal cancer and minimally invasive surgery. He is board certified in both general surgery and colon and rectal surgery. He has been elected as fellow in both the American College of Surgeons and the American Society of Colon & Rectal Surgery, achieving this very early in his career. This gives him the added skill & experience to take care of the most complex diseases of the colon, rectum and anus.

He was raised in Alabama where his extensive family remains. He married his childhood sweetheart & has a young daughter. He enjoys refurbishing furniture in his spare time.

We are happy to provide second opinions regarding your diagnosis and possible surgery.


Lewis_06Dr. W. Cannon Lewis returns to San Antonio bringing multiple areas of expertise in the field of colon and rectal surgery.

Dr. Lewis attended Rice University where he studied Biology and Philosophy. Following graduation, he entered the United States Air Force through the Health Professions Scholarship Program and received his medical degree from Baylor College of Medicine. He completed his General Surgery residency training at the combined University of Texas Health Science Center at San Antonio and Wilford Hall Medical Center program. His fellowship training in colorectal surgery was completed at St. Francis Medical Center in Hartford, CT. His first faculty position was at Keesler Medical Center in Biloxi, MS and he was later appointed Assistant Professor of Surgery at UTHSCSA and WHMC in 2005. He was Associate Program Director for the UTHSCSA General Surgery Residency program from 2006 to 2008.

Military service took him overseas to Iraq and later to an assignment at Aviano Air Base where he served as the Colorectal Surgery consultant for all services serving in Europe. He achieved the rank of Lieutenant Colonel while proudly serving in the USAF.

Dr. Lewis has surgical and academic interests in the areas of minimally invasive surgery, Inflammatory Bowel Disease and pelvic floor disorders. He is board certified in both general surgery and colorectal surgery and he has obtained fellowship status in both the American College of Surgeons and the American Society of Colon & Rectal Surgery.

He and his wife, Jennifer, are both native Texans and they have four children. In his spare time, he enjoys travel, golf, cooking and gardening.