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 Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer, Writer Steven Molaro Executive Producer, Writer Steve Holland Writer David Goetsch Writer Eric Kaplan Writer Maria Ferrari Writer Andrew Gordon Writer Anthony Del Broccolo Writer Tara Hernandez Writer Jeremy Howe Writer Adam Faberman Writer Mark Cendrowski Director