Nicholas is known for his roles in Rookie of the Year (1993), A Kid in King Arthur's Court (1995), and American Pie (1999). He appeared in the first three films of the American Pie franchise as the character Kevin Myers and played Frank Sinatra, Jr. in the Showtime movie Stealing Sinatra as well as a role in Halloween: Resurrection. He also appeared in Grey's Anatomy as Jeremiah. "I started acting when I was 6 years old. I have always enjoyed making people laugh or smile or think" he says. Nicholas released his debut album, Without Warning January 15, 2008.
"I started playing guitar when I was 14. I couldn't stop playing... I am very blessed and thankful for all that has happened." he says.