His songwriting or production credits include the singles "Girls Like You" and "What Lovers Do" by Maroon 5, "Ghosttown" by Madonna, "Heart Attack" by Demi Lovato,[2] "Talk Dirty" by Jason Derulo, "Lovers on the Sun" by David Guetta, and "Shed a Light by Robin Schulz.

Jason and Victoria Evigan began their artist project Elephant Heart, and have released the songs "Hiya" and "Warfare" in 2018.

[2] He has worked with numerous recording artists including Maroon 5, Kelly Clarkson, Demi Lovato, Avicii, Madonna, Nick Jonas, Kiiara, Zedd, Rufus Du Sol, Bebe Rexha, Skylar Grey, Jon Bellion, Starrah, Troye Sivan, Julia Michaels and Britney Spears.

[3] Prior to his career as a writer and producer, Evigan was the lead singer of the Los Angeles-based band After Midnight Project.

Evigan is a member of the production duo "The Suspex" with fellow writer and producer Mitch Allan.