On what CBS sitcom did the By the Book producer appear? 
By the Book (TV series): By the Book is an upcoming American sitcom television series created by Patrick Walsh and produced by Johnny Galecki, with co-executive producers Andrew Haas, Spencer Medof, and director Andy Ackerman. Johnny Galecki: John Mark Galecki (born April 30, 1975) is an American actor. Johnny Galecki:  He is known for playing David Healy in the ABC sitcom "Roseanne" from 1992 to 1997 and Dr. Leonard Hofstadter in the CBS sitcom "The Big Bang Theory" since 2007.
Big Bang Theory