In 1970, he began working as an engineer for Warner Bros. Records. This proved to be a good move, and he would go on to produce albums for a range of successful artists. He also discovered a number of artists who became famous based on his guidance. Artists for whom he produced albums include, The Doobie Brothers, Van Morrison, Van Halen, Carly Simon, Aerosmith, Eric Clapton, Cheap Trick, Joan Jett, and Bette Midler, to name a few. His production work has sold hundreds of millions of albums and singles worldwide and continue to generate enormous sums of money for Templeman in the form of royalties and licensing fees.