Stan Lee

Stan Lee is, in essence, the creator of the Marvel Universe. Along with such greats as Jack Kirby and Steve Ditko, Lee created Iron Man, the Hulk, Thor, Black Widow, Hawkeye, the Avengers, Nick Fury, S.H.I.E.L.D. and many, many others.

He served as a co-producer on Iron Man, The Incredible Hulk, Iron Man 2, Thor, Captain America: The First Avenger, The Avengers, Iron Man 3 ,  Thor: The Dark World. and the television series, Agents of S.H.I.E.L.D..

He will have an Executive Producer credit on Captain America: The Winter Soldier, Guardians of the Galaxy, The Avengers: Age of Ultron and Ant-Man.

Cameos
Stan Lee has played small parts in many of the recent Marvel productions:
 * Iron Man - Himself, mistaken for Hugh Hefner by Tony Stark.
 * The Incredible Hulk - A man poisoned by a drink laced with the Hulk's blood.
 * Iron Man 2 - The chat show host Larry King.
 * Thor - Man who tries to move Thor's hammer using his truck.
 * Captain America: The First Avenger - An elderly general.
 * The Avengers - A man being interviewed on television who didn't believe in super heroes. Also, in a deleted scene, he told Steve to ask the waitress for her number.
 * Iron Man 3 - Beauty pageant judge.
 * Thor: The Dark World - a mental patient.
 * Agents of S.H.I.E.L.D. episode T.R.A.C.K.S. - a train passenger.
 * An unspecified role in Captain America: The Winter Soldier.