This rumpled, elfin character actor is best-known for two continuing roles: the lovelorn operative Herbert Viola on TV's "Moonlighting" (ABC, 1985-89) and Dudley "Booger" Dawson in four "Revenge of the Nerds" movies and TV films. Armstrong began acting in his native Michigan, where he founded his own theater company. By the early 1980s, he was touring with "Da" and appearing in regional theaters around the country.Armstrong made his film debut as Tom Cruise's arrogant pal in "Risky Business" (1983), and the following year created the role of "Booger" in the unexpectedly popular comedy "Revenge
