Usually, we invite famous cognitive scientists (2014: D. Hofstadter, 2013: A. Gopnik, 2012: Marvin Minsky), but E. Snowden was chosen after consultation with the studentry.
https://soundcloud.com/philosophytalk/edward-snowden-and-the-ethics-of-whistleblowing
Blurb from Symsys: https://symsys.stanford.edu/viewing/htmldocument/13638