John Billingsley on The Mentalist

For those who watch the show, this is old news; but for those who don't, here it is.

John Billingsley guest-starred on The Mentalist, on an episode aired on November 18, 2010.
It's episode 9 of season 3, named "Red Moon", directed by the show's star Simon Baker.

John Billingsley guest-stars as an astrologer, Ellis Mars, who helps Patrick Jane to solve a case of a triple homicide.

Yeah, this is Dr. Phlox: