He is known for his roles of Brick Bardo in Cyborg, Kjartan in The Viking Sagas, the title character in the television show Conan the Adventurer, Hagen in Gladiator, Thorak in The Scorpion King, and Ulfar in Pathfinder.

[1] He won the heavyweight class of the 1986 IFBB World Championships, and is still the tallest competitor ever in the Mr. Olympia (he finished last in 1988).

The show aired in 1997–1998 with the premise that Conan, and his three sidekicks, were chosen by the god Crom to fight and vanquish the evil Hissah Zul and become king.

In The Viking Sagas (1996), The Bad Pack (1997), and Gladiator (2000), Moeller appeared alongside fellow bodybuilder Sven-Ole Thorsen.

Moeller went on to appear in El padrino (2004), sequel to The Bad Pack, once again playing Special Agent Kurt Mayers.