Tom Stoppard

When I was younger, I could do something useful just by being free for half a day, but now I need five days to get the world I've left out of my head and ten days or a fortnight not talking to anyone to hold what I need to hold inside my head.

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.