Real World

Ron Perlman

From Halopedia, the Halo wiki

There is more information available on this subject at Ron Perlman on the English Wikipedia.
Ron Perlman

Ronald N. "Ron" Perlman (born April 13, 1950) is an American television and film actor, best known for his roles as the title character from Hellboy, Clay Morrow in Sons of Anarchy, and Deathstroke in Teen Titans.

Perlman voices Lord Hood in Halo 2 and 3.