Louis P. Martini was a Napa Valley vintner who ran the Louis M. Martini Winery in St. Helena, established by his father, Louis M., in 1933. Born in 1918 in Livermore, California, he grew up on a winery in Kingsburg and later in St. Helena, earning his bachelor’s degree in food technology from the University of California, Berkeley, in 1941. Following his military service during World War II, Martini returned to the family winery and worked alongside his father, acquiring new properties and expanding operations until taking over as head winemaker in 1954. In 2008, he was inducted into the Culinary Institute of America’s Vintners Hall of Fame. In this interview, Martini discusses influential professors at UC Berkeley and Davis, technical work and experiments in winemaking, activity in Napa Valley wine organizations, and protections against pests, frost, and disease. This interview is part of a group of interviews documenting the California wine industry.