Chuck Lorre Creator, Executive Producer, Writer Bill Prady Creator, Executive Producer, Writer Johnny Galecki Leonard Hofstadter Actor Jim Parsons Sheldon Cooper Actor Simon Helberg Howard Wolowitz Actor Kunal Nayyar Raj Koothrappali Actor Kaley Cuoco Penny Actor Brooke D'Orsay Christy Vanderbilt Guest Star James Hong Chen Guest Star Carol Ann Susi Debbie Wolowitz Guest Voice Kimberly Brooks Automated Cell Phone Voice Voice Lee Aronsohn Writer, Executive Producer Jennifer Glickman Writer, Consulting Producer Mark Cendrowski Director David Goetsch Executive Producer Robert Cohen Executive Producer Kristy Cecil Associate Producer Peter Chakos Producer, Film Editor Kelly Lee Producer Steven Molaro Producer Stephen Engel Consulting Producer Nikki Valko Casting