Billy Crystal is the author of Still Foolin' 'Em: Where I've Been, Where I'm Going, and Where the Hell Are My Keys? He recently appeared in the film Parental Guidance and lent his voice to Monsters University. In November he will bring 700 Sundays -- the Tony Award-winning play based on his autobiography -- back to Broadway.
Joy Behar is an actress and comic and one of the original co-hosts of The View. Earlier this week she appeared on The Tonight Show with Jay Leno.
David Frum is an author and contributing editor to The Daily Beast, as well as a contributor to CNN. His 2012 ebook, Why Romney Lost is a "forthright analysis that offers a bold, hopeful plan for Republican success in the years ahead." In his latest Daily Beast column, Frum argues that we can save lives by approaching gun control like we did automobile safety.
Chris Hayes is the host of MSNBC's All In With Chris Hayes and the author of Twilight of the Elites, now in paperback. Earlier this month he sat down with Secretary of State John Kerry for an interview about Syria.
Jeremy Seifert joins the panel mid-show. He is the director of "GMO OMG," which opened last week in New York and premieres in LA this Friday. The film "tells the hidden story of the takeover of our food supply by giant chemical companies." Seifert's first documentary, DIVE!, won 21 awards in film festivals worldwide.
Submit your Overtime questions for this week's guests at HBO.com!