The beloved actor who plays Agent Phil Coulson in Iron Man, Clark Gregg, turns 54 today. Coulson is a favorite among many Marvel Studios' Phase One films such as Iron Man, Iron Man 2, The Avengers, and Thor. The actor also takes the lead in Marvel's Agents of S.H.I.E.L.D.. Gregg is versatile, also voicing Disney XD's Ultimate Spider-Man cartoon on which Clark Gregg plays the recurring role of Peter Parker's high school principal.