Thomason was a Starfleet security crewpersonassigned to Deep Space 9 in the 2370s.

In 2373, when Deep Space 9 was overrun by the Mist, Thomason was shot during a phaser fight in Ops and quickly beamed to sickbay. (DS9 - The Captain's Table novel: The Mist)

Starbase Deep Space 9 personnel and residents
Station personnel	K. Adabwe • Ahzed • Aleco V. • Alle T. • Amran • T. Ane • N. Aponte • J.S. Bashir • Battes A. • S. Bowers • Cardok • Cenn D. • Chavez • Cryan • E. Dax • J. Dax • Devro • M. Eddington • Eddon • Etana K. • Gaysd T. • Girani S. • Goodman • Gordimer • Guerette • Hage • Hava • T. Jast • Jataq'qat • S. Jonsson • Kabo • Kahrimanis • Kelly • Kira N. • Kurn • C. Ling • P. Matthias • McCormick • McEwian • K. Merimark • Monyodin • Moru • I. Muckerheide • Munson • J. Si Naran • Nedani I. • Nguyen • Nog • M.E. O'Brien • Occino • Odo • D. Parks • Pertwee • Phongsit • G. Primmin • Redac • K. Richter • Ro L. • Rom • G. Roness • Sanger • Selzner • J. Senkowski • Setrin Y. • Shul T. • B.L. Sisko • N. Sthili • M. Strang • S. Tarses • P. Tenmei • Terek • T. ch'Thane • Tolland • M. Tomson • T'Peyn • Trulli • E. Vaughn • Vu K. • Wasa G. • Wayeh S. • D. Wilkens • Worf • Woros K.
Station residents	Broik • Chram • Conpap • Elvim • Frool • Gann • E. Garak • Grehm • Grimp • Jas-qal • Kaga • Leeta • Modo • Morn • Nog • K. O'Brien • M. O'Brien • K. O'Brien • Quark • Rom • J.I. Sisko • Sorv • Taran'atar • Tora Z. • Treir • Vissh • K. Yates • Yelsi