Alan Oppenheimer. Actor: Westworld. Alan Oppenheimer is an American actor from New York City, who started his career in the 1950s. By the 1970s, Oppenheimer started performing voice acting roles. He eventually emerged as one of the most prolific voice actors in the United States, with roles in numerous series and films. His better known roles include the evil emperor Ming the Merciless in "The New Adventures of Flash Gordon"...