Grey's Anatomy is making history once again. In Thursday's episode, Shoshannah Stern will guest star on the ABC drama as Dr. Riley — the first deaf doctor featured on primetime television. Riley is a diagnostician who comes to Grey Sloan to help DeLuca (Giacomo Gianniotti) try to figure out what's wrong with Suzanne (Sarah Rafferty), but friction occurs when not everyone on Suzanne's case agrees with Riley's methods.