Baldwin was born in Massapequa New York the son of Carolyn Newcomb (nee Martineau) and Alexander Rae Baldwin Jr. a high school account/community studies m and football bus.
Baldwin was raised in a Broad nage of Irish English and French descent.
He attended Alfred G. Berner High School in Massapequa S heart out Atoll and played football there beneath Carriage Bob Reifsnyder who is in the College Football Corridor of Renown.
Baldwin worked as a busboy at the distinguished New York See disco Studio 54. He attended George Washington University from 1976 to 1979 where he was known as "Alex." He then transferred to New York University to learn acting at the Lee Strasberg Playhouse Guild covered by Elaine Aiken and Geoffrey Horne. He returned to NYU in 1994 and graduated with a BFA that year.
The other Baldwin brothers Daniel (Homicide: Existence on the Avenue) William (Backdraft) and Stephen (The Familiar Suspects) all followed him in beautifying actors.