Possible Clues:

• Hale of ''Gilligan's Island''
• Thicke, for one
• Thicke of "Growing Pains"
• Alda or Thicke
• Space pioneer Shepard
• Code-breaker Turing
• Code-cracker Turing
• Ben's predecessor at the Fed
• Shepard who walked on the moon
• Rickman who played Snape