- Studied theatre at Bennington College in Vermont.
- Frequently plays characters of a scientific nature such as doctors or professors.
- In 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.
- Born in Media, Pennsylvania, and raised in Weston, Connecticut.
- Made guest appearances on Journeyman (2007) and Eli Stone (2008), in episodes dealing with San Francisco earthquakes.
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