Born in Media, Pennsylvania, and raised in Weston, Connecticut.
Studied theatre at Bennington College in Vermont.
Has two cats.
In Stargate SG-1: The Other Guys (2002), Billingsley plays a scientist with a fascination with Star Trek (his character states he dresses up as a Vulcan at Star Trek conventions). In Star Trek: Enterprise (2001), Billingsley plays the medical officer Dr. Phlox, whose shipmate is a Vulcan named T'Pol.
Frequently plays characters of a scientific nature such as doctors or professors.
Guest starred in two shows, Journeyman (2007) and Eli Stone (2008), both about San Francisco earthquakes.
Personal Quotes (1)
[on playing Dr. Evan Royce in Angel: Unleashed (2003)] "It was fine. It wasn't a particularly fleshed-out part. Everybody was very nice, and treated me well. I had nothing negative to say but it wasn't something that was particularly memorable."