Dr. David S. Bub was Board Certified in General Surgery in 2002, and in Colon and Rectal Surgery in 2003. After finishing his colorectal surgery training at the Greater Baltimore Medical Center, he conducted a year of research at Sloan Kettering Cancer Center focusing on the diagnosis and management of rectal cancer. Prior to moving to the Lehigh Valley, he practiced at the Mount Sinai Hospital in New York City for six years specializing in the treatment of Crohn’s disease and colitis.