T. Siegel was a Human Starfleet officer in the 22nd century. In 2154, this individual was listed as an Environmental Systems officer on the dedication plaque of the Columbia NX-02. (ENT: "Affliction", dedication plaque) In January of 2155, this individual was listed as an EVA officer on directory placards at Starfleet Command's Fleet Operations Center, Sol Sector. Their office was located in room #3529. (ENT: "Demons", directories)