Born Margaret Millar in Oakland, California, 1935. She studied painting at the Los Angeles Art Center College of Design. In 1956 she moved to New York and worked for Raymond Loewy Associates as a commercial artist. From 1961 to 1963 she worked in Milan at LaRinascente together with her husband Bruce Hopper, a graphic designer. At LaRinascente she illustrated posters and advertisements, collaborating with some leading Italian designers. In 1963 she moved to Honolulu and started working as an art director for a local agency. From the 1970s she totally dedicated herself to painting. In 1983 she opened The Pegge Hopper Gallery in Honolulu’s Historic Chinatown.