Kali Rocha is an American actress. She began her acting career in the mid ’90s. During this time she had roles in the films The Crucible and The Object of My Affection. She also appeared on the miniseries Liberty! The American Revolution. By 2000s, she had made several guest appearances on television, notably as Halfrek on Buffy the Vampire Slayer. She also became known for her recurring role as Dr. Sydney Heron on Grey’s Anatomy. She next joined the main cast of the short-lived series Sherri. In the 2010s, she became known for starring as Karen Rooney on Liv and Maddie.