A.J. Cook. Actress: Criminal Minds. Canadian born actress/director, AJ is best known for her role as "Special Agent Jennifer 'JJ' Jareau" in the CBS long running series CRIMINAL MINDS. She can currently be seen reprising her role on CRIMINAL MINDS: EVOLUTION for Paramount+, which will be going into a second season later this year. AJ has also directed an episode of CRIMINAL MINDS: EVOLUTION this season and did so in...