Dax Randall Shepard is an American actor. Since 2018, he has hosted Armchair Expert, a podcast that interviews celebrities, journalists, and academics about their lives. Shepard is best known for his work in the feature films Without a Paddle (2004), Zathura: A Space Adventure (2005), Employee of the Month (2006), Idiocracy (2006), Let's Go to Prison (2006), Hit and Run (2012), and CHiPs (2017), the last pair of which he also wrote and directed. Shepard portrayed Crosby Braverman in the NBC comedy-drama series Parenthood from 2010 to 2015. He also played Luke Matthews in the Netflix show The Ranch, co-starred in ABC's Bless This Mess, and acted in the MTV practical joke reality series Punk'd (2003).