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 Christine Baranski Dr. Beverly Hofstadter Guest Star Laurie Metcalf Mary Cooper Guest Star Judd Hirsch Dr. Alfred Hofstadter Guest Star Marcus Folmar Police Officer Guest Star Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer Steven Molaro Executive Producer, Writer Tara Hernandez Writer Adam Faberman Writer Steve Holland Writer Jeremy Howe Writer Mark Cendrowski Director