That was over 24 years ago in 1997.
Today he is 66, and has starred in 104 movies in total, 92 since The Jackal was released.
In The Jackal, I think J.K. Simmons looks:
The Jackal scores 6.1 out of 10 on The Movie Database.
J.K. Simmons' first acting role was as 'Patrolman in Park' in Popeye Doyle, released in 1986 when he was 31.