As we approach the 50th anniversary of President Kennedy's speeches at American University and in West Berlin, Ambassador Nicholas Burns, veteran journalist Marvin Kalb, Sergei Khrushchev, Adam Frankel (former Obama speech writer and assistant to Ted Sorensen), Kennedy Library Director Tom Putnam, and Fred Kempe, author of BERLIN 1961: Kennedy, Khrushchev and the Most Dangerous Place on Earth, discuss the lasting influence of these two moments in history. Copyright: John F. Kennedy Library Foundation