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 Regina King Janine Guest Star Joshua Malina President Siebert Guest Star Brian Posehn Bert Guest Star Brooke Dillman Bebe Guest Star Chuck Lorre Executive Producer Bill Prady Executive Producer Steven Molaro Executive Producer Eric Kaplan Writer Maria Ferrari Writer Andrew Gordon Writer Steve Holland Writer Anthony Del Broccolo Writer Tara Hernandez Writer Mark Cendrowski Director