During his time at CIE, Theroux specialized in the use of radio for Nonformal Education. When combined with a doctoral dissertation about the use of entertainment formats for education, he caught the attention of the research staff at Sesame Street, where he worked for two years. That job led him to transition to the business side of television, and he went on to earn an MBA from the Harvard Business School. He then spent three years as a manager with Time Warner Cable, and in 1984 he founded Metropolitan Cablevision and became its CEO.