Jon Stewart

Frankly, as much as I love to improvise, it hasn't been difficult to stick to the script on 'Mad Men.' The writing is so precise, and the story so carefully crafted, that I don't think there's room - or need - for ad libbing. I could never come up with dialogue as lovely as these writers do, anyway.

To play a lawyer and have one year of law school under your belt, you sort of know what you're talking about! I'm able to memorize the legal courtroom stuff a lot faster than I would have been able to otherwise.