Partner, Daniel Mann Johnson and Mendenhall (DMJM), Los Angeles, CA, 1946-

Irvan Mendenhall was born in Los Angeles, CA; in 1920, his family resided in a rental dwelling at 121 Culver Street, Compton, CA; the Census of 1930 indicated that the Mendenhall's lived in a $20 per month rental at 527 McClelland Street, Santa Maria, CA.

Irvan's parents married about 1910. His father was Kenneth Mendenhall (born c. 1885 in CA), who worked in 1920 as a teamster. Ten years later, he was a Superintendent in the CA State Highway Department. According to the US Census of 1920, both of his parents came from PA. (The US Census of 1930 indicated that his father came from IN, his mother PA.) Irvan Mendenhall's mother, Roxie Young Mendenhall (born c. 1885 in CA), maintained the household which included 4 children in 1920. They were: Lois (born c. 1912 in CA), Jean (born c. 1913 in CA), Fay (born c. 06/1916 in CA) and Irvan. According to the 1920 US Census, Roxie's father came from IN, her mother IL; ten years later, this was noted as IN and MO respectively.