Jason began his short film career in Nash Bridges (1996) in 1996. He continued acting and residing in the Bay Area before moving on to modeling. He was discovered by a photographer on location for Ne Yaptığını Biliyorum (1997) where he had been doubling for Freddie Prinze Jr.. Jason went on to pose for some of today's top magazines including Industry , Men's Workout, Men's Fitness, YMLA Magazine, Hong Kong Silk, Joe Boxer Int., For Women UK, InStyle Magazine, Playgirl, and many others. He has been linked to actress Jennifer Love Hewitt as well as a former Miss Florida.

In 2005, Baca began modeling for romance novel covers. As of August 2012, he has graced the covers of over 100 romance and sci-fi novels. Jason is known best for his candid interviews with numerous author blogs expressing his concern for smooth skin and maintaining good health.

In 2011, he appeared in Men's Fitness Australia, Exercise & Health Magazine, Men's Workout, Optimyz Fitness and Scene Bay Area doing various interviews on how to stay fit and younger looking.