AJ Cook, born Andrea Joy Cook on July 22 in Oshawa, Ontario, Canada, is a Canadian actress and director best known for her role as Special Agent Jennifer "JJ" Jareau in the long-running CBS series Criminal Minds. Cook has reprised her role in Criminal Minds: Evolution on Paramount+, which is set to continue into its second season. In addition to her acting career, Cook has directed episodes of Criminal Minds, showcasing her versatility in the entertainment industry.

Cook's film credits include The Virgin Suicides, Out Cold, Back Fork, and Final Destination 2. Her journey into acting began with a McDonald's commercial in 1997, and before that, she was a competitive dancer and dance instructor in her hometown. Despite facing challenges such as extreme astigmatism, which led to her being declared legally blind, Cook underwent a successful eye-implant surgery that significantly improved her vision. She is married to Nathan Andersen and has two children, Mekhai and Phoenix, who have also appeared on Criminal Minds as her character's sons.

A memorable quote from Cook's role in Final Destination 2 reflects her dedication: "It's challenging in the way that it's a lot of work, I'm very busy. It's challenging in a way that it's a sequel and I feel I got big shoes to fill." Cook's laid-back lifestyle and appreciation for her fans further highlight her down-to-earth personality: "I am just your everyday, average girl. I live by the beach. I wear flip flops. I don't wear make-up. I go to the gym. My husband and I are just really laid-back people."