A.J. Cook worked with an actor.
Andrea Joy `` A. J. '' Cook -LRB- born July 22 , 1978 -RRB- is a Canadian actress known for her role as Supervisory Special Agent Jennifer `` JJ '' Jareau in the CBS crime drama Criminal Minds.
The show has an ensemble cast that has had many cast member changes since its inception.
Thomas Gibson , Shemar Moore , Matthew Gray Gubler , A. J. Cook , and Kirsten Vangsness are the only actors to have appeared in every season.
