Marks, John H.

John H. Marks, MD

Resident Faculty

Dr. Marks directs a colorectal surgical research team and a fellowship in advanced rectal cancer management, one of only four in the United States. His research and educational programs focus largely on minimally invasive laparoscopic and robotic colorectal surgery featuring radical sphincter preservation resection for rectal cancer after neoadjuvant therapy, one of the largest series of its kind in the world.

  • 1999–present: Professor, Lankenau Institute for Medical Research
  • 2001–present: Chief, Colorectal Surgery, Main Line Health
  • 2001–present: Director, Fellowship in Laparoscopic and Minimally Invasive Colorectal Surgery and Advanced Rectal Cancer Management, Main Line Health
  • 2019–present: Program Director, National Accreditation Program for Rectal Cancer
  • 2020–present: James Widener Ray Endowed Chair in Colorectal Surgery