Glen McCready

 voiced several roles in various Big Finish Doctor Who audio stories and spin-offs.

Doctor Who Main Range

 * Harry Houdini's War - Professor Winter

Doctor Who Special Releases

 * The Legacy of Time
 * The Split Infinitive - Vince

Fourth Doctor Adventures

 * The Enchrantress of Numbers - Edward Scheutz / Lord Byron / Harry

Doom Coalition

 * The Eighth Piece / The Doomsday Chronometer - Molvan / the Solvers

UNIT: The New Series

 * Hosts of the Wirrn - Marcus / Evans / Jacob