Johnny Galecki Leonard Hofstadter Actor Jim Parsons Sheldon Cooper Actor Kaley Cuoco Penny Actor Simon Helberg Howard Wolowitz Actor Kunal Nayyar Raj Koothrappali Actor Christine Baranski Dr. Beverly Hofstadter Guest Star Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer, Writer Lee Aronsohn Writer Steven Molaro Writer Richard Rosenstock Writer Maria Ferrari Writer Dave Boerger Writer Mark Cendrowski Director