Licensed building designer Cliff May (1908-1989) is considered the father of the California ranch house. Not a trained architect, May designed some 18,000 tract homes and over 1,000 custom homes throughout the United States, primarily in Southern California. In the 1930s, he pioneered his California ranch house designs, which combined the western ranch house and the Spanish hacienda with elements of Modernism. May’s residential designs are characterized by their unique relationship to the outdoors. Large windows and sliding glass doors effectively erase the line between indoor and outdoor spaces.