Patient Portal; Home » Physicians » Sean O'Donovan. Sean O'Donovan. Dr. O'Donovan. Sean C. O'Donovan, MD, FACS, FASCRS - Retired. Dr. O'Donovan has been with the practice since 1993. He specializes in the treatment of colon and rectal cancer, laparoscopic colon surgery, and the diagnosis and treatment of intestinal and anorectal ....