Jason Morgan Ritter (born February 17, 1980) is an American actor. He is known for his roles as Kevin Girardi in the television series Joan of Arcadia, Ethan Haas in The Class, Sean Walker in the NBC series The Event, Dipper Pines in Gravity Falls, and Pat Rollins in Raising Dion. He also played the recurring role of Mark Cyr in the NBC television series Parenthood, for which he received an Emmy Award nomination. In 2017, he starred in the TV comedy series Kevin (Probably) Saves the World. He served as the voice of Ryder in Frozen 2.