Mason was a Human male, alive during the late-24th century.
Born in 2355, and the son of serving Starfleet officers, Mason lived aboard the USS Enterprise-D during the mid-2360s.
In 2364, Mason was one of several Enterprise-D children kidnapped by the Aldeans in an effort to repopulate their planet. At the time of his kidnapping he was walking with his parents down a corridor. He later participated in Wesley Crusher's attempt at passive resistance. (TNG: "When The Bough Breaks")
Mason was portrayed by Wil Wheaton's younger brother Jeremy Wheaton, who received no on-screen credit for his appearance.
The script for "When The Bough Breaks" states Mason was nine years old at the time of the episode, placing his birth year in 2355.