Mr. Guild joined McGavren Radio, a radio advertising representation firm based in San Francisco, in the late 1950s and, shortly thereafter, opened up the company's first east coast office in New York. The company was renamed McGavren Guild, and Mr. Guild was named President and COO in the late 1960s. In 1981, Mr. Guild created Interep Radio. In 1986, under Mr. Guild's stewardship, Interep launched Group W Radio Sales, which ultimately became CBS Radio Sales. Other dedicated rep companies created by Interep include ABC Radio Sales. In the early 1990s, Interep implemented Radio 2000, and in the late 1990s formed Interep Interactive, an online advertising and streaming media division. Interep Interactive merged with Cybereps, a premium online ad sales and marketing firm, to form the first interactive marketing and integrated media sales and web publishing company. Mr. Guild finds time for a variety of pro bono activities. He was a trustee of the University of the Pacific, where he received an honorary doctorate degree, and was also a trustee of the Paley Center for Media in New York and Los Angeles. He was a member of the Board of Trustees of the Brubeck Institute Broadcasting Foundation and has been inducted into the Broadcasting and Cable Hall of Fame and also the Radio Hall of Fame in Chicago. He was an International Radio and Television Society's 2001 Gold Medal recipient. Mr. Guild was a producer/investor in Broadway and Off Broadway shows including The History Boys, which won the Tony Award for Best Play of the Year. He is also a board member of the Dreyfoos School of the Arts Foundation (SOAFI).