In May 2012, DCEG welcomed David Schottenfeld, M.D. as a Visiting Scholar. During this special visit, Dr. Schottenfeld and Joseph F. Fraumeni, Jr., M.D., participated in a panel discussion, which was moderated by Robert N. Hoover, M.D., Sc.D. on Cancer Epidemiology over the Last Half-Century and Thoughts on the Future. The discussion focused on their personal reflections about their past mentors and colleagues, noteworthy contributions to the field, and how cancer epidemiology has evolved as a discipline.