Steve Mollmann said:
John Rhys Davies is everyone's favorite Tellarite, Mor glasch Tev. (Or David Ogden Stiers, if you're so inclined.)
When I wrote Tev's debut story, it was with Stiers's appearance and voice in mind, although I made him somewhat shorter than Stiers (or Rhys-Davies). However, JRD would be a good choice.