Brent Spiner has an extensive movie, TV, and theatre career. Some of the better known ones are Independence Day, Master of Disguise, Friends, Cheers, Joey, Law & Order: Criminal Intent, Outer Limits, and 1776.
Brent Spiner. He's absolutely brilliant in Star Trek and in everything else he does. And if anyone's heard the soundtrack to 1776, a Broadway musical he starred in (nominated for a Tony award, I might add), you know he can sing! I can't say enough about him.