Stan Lee

Stan Lee, born Stanley Leiber, is one of the first and most prolific writers/creators of the Marvel Universe. Along with such greats as and, Lee created Iron Man, the Hulk, Thor, Black Widow, Hawkeye, the Avengers, Nick Fury, S.H.I.E.L.D., Daredevil, Groot and many other well known characters.

He served as a executive 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, Agents of S.H.I.E.L.D., Captain America: The Winter Soldier, Guardians of the Galaxy, Agent Carter, Avengers: Age of Ultron, Ant-Man and Doctor Strange.

He personally wrote the tie-in comic Captain America: Evil Lurks Everywhere.

He was also interviewed for the documentary Marvel 75 Years: From Pulp to Pop.

Cameos
Stan Lee has played small parts in every Marvel Cinematic Universe film and TV series to date.
 * Iron Man - Himself, mistaken for by Tony Stark.
 * The Incredible Hulk - A man poisoned by a drink laced with the Hulk's blood.
 * Iron Man 2 - 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 Rogers to ask the waitress for her number.
 * Iron Man 3 - Beauty pageant judge.
 * Thor: The Dark World - Mental patient.
 * Agents of S.H.I.E.L.D. episode: T.R.A.C.K.S. - Train passenger.
 * Captain America: The Winter Soldier - Smithsonian security guard.
 * Guardians of the Galaxy - Xandarian Ladies’ Man.
 * Agent Carter - Episode 4

Trivia

 * Stan Lee is one of the few actors in the Marvel Cinematic Universe who has portrayed different characters.
 * Stan Lee has also had cameos in several non-Marvel Cinematic Universe films based on Marvel properties.
 * Stan Lee appeared in Disney Pixar's Big Hero 6 as Fred's father.