Stephen Breyer, former Associate Justice of the United States Supreme Court
Michael E. Fossum, Retired Astronaut
Robert F. Gates, former U.S. Secretary of Defense and Director of the C.I.A
Chris Hadfield, Retired Astronaut
Mike Massimino, Retired Astronaut
Lin-Manuel Miranda - Send letter via USPS to: Lin-Manuel Miranda, 4867 Broadway, Unit 743, New York NY 10034
Don Thomas, Retired Astronaut
Erik Weihenmayer (athlete, adventurer, author, and motivational speaker)