Possible Clues:

• Moonwalker Shepard
• Milne's first name
• Rock 'n' roll pioneer Freed
• Greenspan of the Fed
• The first "A" in A.A. Milne
• Hale of "Gilligan's Island"
• Codebreaker Turing
• Rickman of Harry Potter movies
• English playwright Ayckbourn
• Jackson of country