The multi-camera master opens up about Charlie Sheen's meltdown ("a terrible time"), the cancellation of 'Mike & Molly' ("CBS was never terribly enthusiastic"), the future of 'Big Bang' ("a Leslie Moonves question"), his passion for 'Mom' (even though it's "much more difficult" to write than his other shows), his next show ("I'd love to try and work in another way") and more.