Ed Metzger is a victim of typecasting who decided to fight back.

"I'm 5-foot-11 and 195 pounds, and it seems like everyone thinks of me as a cop," says Metzger. But after playing dozens of cops and heavies and such TV shows as "Kojak," "Baretta," "Kaz" and "The Bionic Woman" and such movies as "Carwash" and "Dog Day Afternoon," Metzger decided to go cerebral. For the last 2 1/2 years, this 44-year-old alumnus of the Actors' Studio has been touring the country with a one-man show called "Albert Einstein, The Practical Bohemian," directed and co-written by Laya Gelff. The tour takes Metzger to the Reston Community Center Theatre Friday and Saturday.

Metzger made his "Einstein" debut in October 1978 at a small nonunion theater in Los Angeles, where the show played to capacity houses for three months. At first, says Metzger, "I didn't know what we had. I was saying to myself, 'How do I go about bringing this person to the stage so that people could not only be entertained but also know something of the feeling of the man and his impact?'"

But the reviews were so enthusiastic that "everyone was stunned," he says, "and I must say that I was stunned myself."