Amadeo Giannini

Amadeo Pietro Giannini was born in San Jose, California, to Italian immigrant parents. He was the first son of Luigi Giannini (1840–1877) and Virginia (née Demartini) Giannini (1854–1920). Luigi Giannini immigrated to the United States from Favale di Malvaro near Genoa, Liguria, in the Kingdom of Sardinia (later part of Italy) to prospect in response to the California gold rush of 1849. Luigi continued in gold during the 1860s and returned to Italy in 1869 to marry Virginia, bringing her to the US and settling in San Jose. Luigi Giannini purchased a 40-acre (16 ha) farm at Alviso in 1872 and grew fruits and vegetables for sale. Four years later, Luigi Giannini was fatally shot by an employee over a pay dispute. His widow Virginia, with two children and pregnant with a third child, took over operation of the produce business. In 1880, Virginia married Lorenzo Scatena (1859–1930) who began L. Scatena & Co. (which A. P. Giannini would eventually take over). Giannini attended Heald College but realized he could do better in business than at school. In 1885, he dropped out and took a full-time position as a produce broker for L. Scatena & Co.

Giannini worked as a produce broker, commission merchant and produce dealer for farms in the Santa Clara Valley. He was successful in that business. He married Clorinda Cuneo (1866–1949), daughter of a North Beach, San Francisco real estate magnate, in 1892 and eventually sold his interest to his employees and retired at the age of 31 to administer his father-in-law's estate.

He later became a director of the Columbus Savings & Loan, in which his father-in-law owned an interest. Giannini observed an opportunity to service the increasing immigrant population that were without a bank. At loggerheads with the other directors who did not share his sentiment, he quit the board in frustration and started his own bank.

He was one of the original Board of Directors of the Italian Board of Relief, now known as Italian Community Services, founded in 1916. It is a non-profit organization focused on serving the Italian and Italian-American community.

Giannini had long been a Republican, but with the collapse of the Republican Party in the Great Depression, he concerned himself with Democratic state politics. In the 1934 California gubernatorial election Giannini worked hard to block left-wing novelist Upton Sinclair from winning the primary for the Democratic nomination. He failed, and with support from the White House, he endorsed and helped finance the Republican candidate, incumbent Frank Merriam, who did defeat Sinclair.