At the age of five Lukas was discovered in his kindergarten by casting director Marjorie Simkin. His first film role was that of the youngest of the doomed children in Testament (1983). By 1985, he gained notice when he starred as Samuel, the little Amish boy who witnesses a murder in Witness. He was nominated for an Emmy in the Television Movie The Ryan White Story (1989). By his teenage years, he appeared with Jessica Lange in the Music Box, and Steve Martin in Leap of Faith. On Broadway, Lukas starred with Steve Martin and Robin Williams in "Waiting for Godot".


Son of Emily Tracy. Dated Natalie Portman. [July 2001] Lukas enjoyed ice skating (hockey) and turned up on occasion at the ice rink at Northcross Mall in Austin (1986-1988). He was a good skater, by the way, and the employees were quite fond of him. Good friends with Leonardo DiCaprio. He was inducted into the Texas Film Hall of Fame on March 11, 2010 during the occasion of their 10th anniversary awards ceremony.