His acting career has spanned four decades, during which he has appeared in more than 50 feature films and a number of television shows and stage productions.

In 1989, he appeared in the film Music Box, as the 12-year-old son of Jessica Lange's character, and grandson of an immigrant who is accused of being a war criminal.

Haas also gained recognition for his portrayal of The Patient in the music video for the My Chemical Romance song "Welcome to the Black Parade".

He has made guest appearances in Amazing Stories, both the 1985 and the 2002 versions of The Twilight Zone, The Young Indiana Jones Chronicles, As Told by Ginger, The Zeta Project, 24, Criminal Minds, Dirt and Entourage.

[6] In 2018, Haas played astronaut Michael Collins, the Apollo 11 Command Module Pilot, in First Man, a film about the first human Moon landing space flight in 1969.

He appeared in the music videos for OutKast's "Roses," My Chemical Romance's "Welcome to the Black Parade," UGK's "International Player's Anthem (I Choose You)," Death Cab For Cutie's "Cath…," and Jet's "She's a Genius".

The recorded and video clip were filmed in Lukas' LA studio, and were later revealed to be a marketing campaign of the Portuguese band The Gift for their album Explode.