Katey Sagal of Married with Children and of course 8 Simple Rules fame plays Gemma Teller Morrow on SOA. She is married to show creator Kurt Sutter. The audition probably went like this:
Kurt: You’ll be reading for the part of Gemma Teller Morrow, the matriarch of the criminal motorcycle club. She’s a bad women who gets what she wants no matter the price.
Katey: I’ll take it.