In 1913, Gordon Whitnall founded the Los Angeles City Planning Association, and in 1920, he established the Los Angeles City Planning Department. From 1920-1930, he was Director of Planning for Los Angeles, and from 1929-1930 was president of the League of California Cities. From 1932-1935 he was the coordinator of the Committee on Government Simplification for Los Angeles County. In 1941, Gordon and Brysis Whitnall established a planning and government
consulting firm in Los Angeles. Gordon Whitnall was an instructor in Planning at the University of Southern California, and a member of the American Society of Planning Officials, the American Institute of Planners, the American Society of Consulting Planners, and the International Fraternity of Lambda Alpha, Los Angeles Chapter.