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:  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.
i don't know