Owen Harper

From Tardis Wiki, the free Doctor Who reference

A long-serving Torchwood operative, Harper performs medical, anthropological and dissection duties for the Torchwood 3 team. Moody and forthright, Harper isn't slow to show his dissatisfaction with Jack Harkness's descisions.

Despite Owens affair with Gwen Cooper his true love exists in the form of Diane Holmes, a daring airwoman from 1953 whose airplane, the Sky Gypsy, fell through the Cardiff Rift. (TW: Out of Time)

Other information

Possibly, like Toshiko Sato, Harper once worked for UNIT or at least he had UNIT security clerance. Or else he has a fake ID.
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