[1][self-published source] Mosher was a Taliesin apprentice of Frank Lloyd Wright, and a pioneer of the post-war modernist architecture movement in San Diego.
[3] Mosher's career was advanced when his design for a home for Herbert and Minerva Kunzel of Point Loma, received media exposure by way of Sunset magazine.
During the period at House Beautiful, Mosher interviewed his hero, Frank Lloyd Wright for a special 1955 issue of the magazine.
In preparation for the issue, Mosher shadowed Wright around his studio, Taliesin, in Spring Green, Wisconsin over the course of two separate weeks.
Mosher's design of the Golden Door Spa in Escondido, opening in 1958, illustrated his aptitude for historical architecture, as well as his usual modernism.