A familiar character actor, he has appeared as a guest star on numerous TV comedies and dramas, including "Soap", "The Rockford Files", "Quincy, M.E.", "", and many others. In 2012, Daniels appeared in the ninth season of "Grey's Anatomy" as Dr. Craig Thomas, an unlikely mentor to the character of Dr. Cristina Yang played by actress Sandra Oh. His character, Dr. Thomas, died in the operating room while performing a procedure to repair a heart defect midway through the season, which forced Yang to move back to Seattle.