On Buffy the Vampire Slayer, Gellar’s stunt doubles were Sophia Crawford, Melissa Sue Barker, and Michelle Waitman. Those three combined to double for Gellar in her all films as well, until POSSESSION when Krista Bell did the stunt work. One or more of these may do the regular stunt work on RINGER
For the RINGER pilot, however, there were two new stunt doubles for Sarah Michelle Gellar. Julia Royter and Laurie Singer, neither of whom has much experience. There is some information about Royter, though. She was interviewed by kidswithcandy.com where she described herself in this way:
“I’m a stunt woman, actress, dancer, singer. I spin fire and I like eating fire. I play with machetes. I’m a choreographer as well. I’m an aerialist.”
She is from Russia, lives in Brooklyn, and used to be a gymnast. Her height is 5′ 4″ and she is 28 years old. She has a stunt reel on YouTube.
Laurie Singer is 25, was also a gymnast, and has participated in New York state fitness competitions. She has also been a stunt double on BODY OF PROOF. She is a “trained hip-hop dancer”, has blue eyes, and is 5′ 3″ tall.
Singer also has a stunt reel on YouTube.