Magnin with Charlotte Mailliard Shultz, 1985
|Occupation||Business executive, philanthropist|
|Spouse(s)||Anna (Smithline) Magnin
Lillian (Ryan Helwig) Magnin
|Children||Donald I. Magnin
Ellen Magnin Newman
|Relatives||Isaac Magnin (paternal grandfather)
Mary Ann Magnin (paternal grandmother)
Edgar Magnin (cousin)
Mae Magnin Brussell (niece)
Cyril Isaac Magnin was born on July 6, 1899. His father, Joseph Magnin, was the founder of Joseph Magnin Co.. His mother was Charlotte Magnin. His paternal grandfather, Isaac Magnin, was a Dutch-born frame carver and gilder. His paternal grandmother, Mary Ann Magnin, was the founder of I. Magnin, an upscale women's clothing store in San Francisco, California. His cousin, Edgar Magnin, was the rabbi of the Wilshire Boulevard Temple, a Reformed Jewish congregation.
He served as the President of Joseph Magnin Co. from 1940 to 1952. He then served as its Chairman and Chief Executive Officer from 1952 to 1970. It evolved into a multi-million dollar chain, selling fashion for young women.
He was President of the Port of San Francisco and was instrumental in establishing such internationally-renowned institutions as the Asian Art Museum, the American Conservatory Theater and the California Culinary Academy, serving as Head of the California Museums Foundation. He served on the Board of Directors of the San Francisco Film Festival. Additionally, he served as the Head of the National Conference of Christians and Jews for two terms. He was also a fundraiser for the March of Dimes and the American Cancer Society.
Magnin was a veteran political fund-raiser and power broker in the Democratic Party. He was Treasurer of President Franklin Roosevelt's northern California re-election campaign in 1944, a delegate to the Democratic National Convention in 1948 (that nominated President Harry Truman) and again in 1964, when he co-chaired the Finance Committee of President Lyndon Johnson's campaign in California.
Throughout the 1950s and 1960s, Magnin was one of a quartet of fabulously wealthy San Francisco Jewish contributors to Democratic candidates, appreciatively called "The Green Machine" by career politicians, the others being Fairmont Hotel magnate Benjamin Swig, Lilli Ann clothing company founder Adolph Schuman, and real estate mogul Walter Shorenstein. The four did not always agree in their choice of candidates. Magnin himself was a major donor to the presidential candidacies of John F. Kennedy in 1960 and Robert F. Kennedy in 1968, and, in the interim, developed a close friendship with Lyndon Johnson.
He was married to Anna (Smithline) Magnin, who died in 1948. They had two sons and a daughter: Donald I. Magnin, Jerry Magnin and Ellen Magnin Newman. He remarried to Lillian Ryan Helwig in 1951, only to divorce a decade later, in 1961.
He was a 'non-practising Jew.'
He died on June 9, 1988.
- Katherine Bishop, Cyril Issac Magnin, 88, Ex-Head Of Store Chain and Patron of Arts, The New York Times, June 9, 1988
- Mark A. Stein, Revolutionized Clothing Business : Cyril Isaac Magnin, 88; Called 'Mr. San Francisco', The Los Angeles Times, June 9, 1988
- Robert P. Swierenga, The Forerunners: Dutch Jewry in the North American Diaspora, Detroit, Michigan: Wayne State University Press, 1994, pp. 309-312 
- Willie Brown, Sen. Kennedy Drew on S.F.'s Green Machine early, SFGate.com, August 30, 2009
- Cyril Magnin and Cynthia Robins. Call Me Cyril (NY,1981); Bernice Scharlach. Dealing From the Heart, A Biography of Benjamin Swig (San Francisco, 2000)