Chester Leo "Chet" Helms (August 2, 1942 – June 25, 2005), often called the father of San Francisco's 1967 "Summer of Love," was a music promoter and a counterculture figure in San Francisco during its hippie period in the mid- to-late 1960s. Helms was the founder and manager of Big Brother and the Holding Company and recruited Janis Joplin as its lead singer. He was a producer and organizer, helping to stage free concerts and other cultural events at Golden Gate Park, the backdrop of San Francisco's Summer of Love in 1967, as well as at other venues, including the Avalon Ballroom.