Jason Ritter is an American actor who is the grandson of actor and musician Tex Ritter and the son of late actor John Ritter. He is best known for his role as Kevin Girardi on the CBS fantasy/family drama series Joan of Arcadia from 2003 to 2005 and as Sean Walker on the NBC serial drama series The Event from 2010 to 2011. He voiced Dipper Pines on the Disney Channel animated series Gravity Falls (including voicing Dipper's clones in the episode "Double Dipper").