He became the head of Kaleidoscope Films Ltd., a movie trailer production company, before starting his own company, Don LaFontaine Associates, in 1976. Shortly thereafter, he was hired by Paramount to do their trailers and was eventually promoted to vice president. He decided to get back into trailer work and left Paramount, moving to Los Angeles in 1981. LaFontaine was contacted by an agent who wanted to promote him for voiceover work, and from then on worked in voiceovers. At his peak, he voiced about 60 promotions a week, and sometimes as many as 35 in a single day. Once he established himself, most studios were willing to pay a high fee for his service. His income was reportedly in the millions.