At the age of five, he was discovered in his kindergarten by casting director Marjorie Simkin. Haas’s career has spanned more than twenty years during which time he has appeared in more than thirty-six feature films, as well as a number of television shows and theater productions. His first screen role was as a child in the 1983 nuclear holocaust film Testament.

Haas became more widely-known in 1985 when, aged eight, he appeared opposite Harrison Ford in Witness. His performance as the Amish child who is the sole witness to an undercover cop's murder was well-received by critics. Haas followed this with parts in films such as Lady in White and Solarbabies.

Haas played AIDS victim Ryan White in the controversial TV movie, The Ryan White Story, for which he received an Emmy nomination. On stage in 1988, Lukas performed alongside Steve Martin and Robin Williams in Samuel Beckett’s Waiting for Godot at Lincoln Center in New York City for director Mike Nichols.

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