John Milton Ramm was born in San Francisco, California, on October 27, 1904. His parents were Antoinette Ramm and John Henry Ramm (1879-1948), who was also a painter and photographer, most notably recording the damage of the 1906 earthquake and fire. After graduating from Lowell High School in 1921, John Milton Ramm attended the California School of Fine Arts and later continued his art-related studies under his father. Between 1923 and 1938, he sailed on over a dozen merchant ships, traveling around the world performing various shipboard duties in addition to recording his surroundings in letters, drawings, and photographs. From 1928 to 1929, Ramm worked as a commercial artist and painted sets and backdrops for several motion picture studios including United Artists and Warner Brothers. Between 1932 to 1941, he painted murals and decorated the interiors of various business establishments such as restaurants and stores. In 1937, he was an art instructor at the San Francisco Boys' Club and at a W.P.A. Recreation Project Training course. From 1941 to 1945, Ramm was employed as a shipfitter and engineering draftsman aboard various ships. He was married to Hungarian-born Gabriella Vigh.
John Milton Ramm died February 26, 1984 in Alameda, California.