Lilja attended the
University of California, Los Angeles between 1984 and 1988, from which he graduated with a
B.S. degree in
Microbiology. In 1984, Lilja joined the group Manic Subsidal, which eventually changed its name to The Offspring in 1986. Lilja played on the group's first demo tape in 1986, which earned them early exposure through a positive review in
Maximumrocknroll magazine. Later that year, Lilja performed on the band's debut single, "
I'll Be Waiting" released through Black Label Records. Lilja also helped write the song "Beheaded," later featured on the group's debut album,
The Offspring (1989). Lilja amicably departed from the Offspring; frontman
Dexter Holland has said that Lilja was so focused on getting into
medical school that the band let him go on friendly terms. ==Medical career==