Alec has starred in several films, including "Beetlejuice", "Miami Blues", "The Hunt for Red October", "Malice", "The Shadow", "Glengarry Glen Ross", "Heaven's Prisoners", "Ghosts of Mississippi", "The Edge", "The Cat in the Hat", "The Aviator", "The Departed", "Running with Scissors", "The Good Shepherd" and many others. He received the National Board of Review Award for Best Supporting Actor for "The Cooler", directed by Wayne Kramer (2003) and was nominated for an Oscar for the same film.

On television, Baldwin is currently starring in NBC's Emmy award winning comedy series, "30 ROCK", for which he received the 2007 Golden Globe, SAG and Television Critics Association awards as Best Actor in a comedy. Baldwin has starred on "Knot's Landing" for CBS and numerous other TV shows including "Dress Grey" (a miniseries for NBC), "Nuremberg: Infamy on Trial (for TNT) and appearances on "Saturday Night Live" (too many to count).