Past LecturersWatch Past Lectures Nora Tyson, Retired Vice Admiral United States Navy, Oct. 2, 2018: Margaret Chase Smith and Me: The Importance of Leadership Angus King, United States Senator, November 10, 2016: Maine and Climate Change: The View from Greenland Susan Collins, United States Senator, March 31, 2015: Incivility and Hyperpartisanship: Is Washington a Symptom or the Cause Susan Collins, United