Chuck Lorre Creator, Executive Producer Bill Prady Creator, Executive Producer Johnny Galecki Leonard Hofstadter Actor Jim Parsons Sheldon Cooper Actor Kaley Cuoco Penny Actor Simon Helberg Howard Wolowitz Actor Kunal Nayyar Raj Koothrappali Actor Mayim Bialik Amy Farrah Fowler Actor Melissa Rauch Bernadette Rostenkowski Actor Joshua Malina President Siebert Guest Star Sean Astin Dr. Pemberton Guest Star Kal Penn Dr. Campbell Guest Star Caleb Pierce Jess Guest Star Steven Molaro Executive Producer Eric Kaplan Writer Andrew Gordon Writer Anthony Del Broccolo Writer Steve Holland Writer Maria Ferrari Writer Tara Hernandez Writer Mark Cendrowski Director