Ralph Johonnot was born in Syracuse, New York on July, 28, 1880.
Johonnot taught art at the Pratt Institute in 1909. He left Syracuse in 1912 and settled in California in Pacific Grove on the Monterey Peninsula. During the 1930s he had an artists' supplies shop in Carmel and taught art privately.
Johonnot passed away in Los Gatos, California on November 19, 1940.