Biografie

One year for his birthday, his friends took him to a diner. They told him to close his eyes. When he opened them, William Shatner, aka Captain James T. Kirk, was in front of him. Captain Kirk was Jason's childhood hero.

Started losing his hair at the age of 16.

While filming Seinfeld (1989), was always fitted with a suit one size too small, to make his character look "uncool"

The only major cast member of Seinfeld (1989) to also direct an episode of the series.

In Seinfeld: How It Began (2004), a documentary for the Seinfeld (1989) DVD, Alexander said that he had no idea that 'George Costanza (character)' was based on Larry David until he said of a script to David, "this could never happen to anyone, and even if it did, no human being would react like this" to which David replied, "What do you mean? This happened to me once, and this is exactly how I reacted!".

I'm not really bald. I shave my head to keep in character with George.

The greatest part of the job was... that was for nine years it was a pleasure to go to work.

I'm always more motivated by the pain of a funny character than by what makes him funny.

I would work with any one of them again in a heartbeat because it was joyous and incredibly easy.

I still don't know much about directing a movie.