Harold Olmo was a leading figure in viticulture and enology and a professor at the University of California, Davis. Born in San Francisco in 1909, he graduated from UC Davis in 1931 and earned his PhD in genetics from UC Berkeley in 1934. Back at Davis, he was soon hired by Frederic Bioletti as a viticulturist and went on to conduct research for the university’s Department of Viticulture for over forty years. He has worked with numerous national and international organizations, including the United States Department of Agriculture and the Food and Agriculture Organization of the United Nations, and in 1973, he received a merit award from the American Society of Enologists for his contributions to the field. In this interview, he discusses his education and early work with Bioletti, the creation of new grape varieties, university-industry relations, and his research abroad in countries such as Afghanistan and Brazil. This interview is part of a group of interviews documenting the California wine industry.