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McDuffie is best known for developing the Claremont and Northbrae neighborhoods of Berkeley and St. Francis Wood district in San Francisco. His upscale developments were laid out as "residential parks," with streets that follow the contours of the hills and power lines that run underground.
McDuffie's developments included covenants to exclude non-whites from home-ownership, and he promoted zoning laws to exclude non-whites.
McDuffie was also a notable conservationist. He was president of the Sierra Club from 1928 to 1931 and from 1943 to 1946.
East Bay Regional Park District
California state parks
Along with Joseph N. LeConte and James S. Hutchinson, he pioneered a high mountain route in 1908 from Yosemite National Park to Kings Canyon, roughly along the route of the modern John Muir Trail. In 28 days, they completed a trip of 228 miles through the high mountains, including several previously unexplored sections.
- Lorey, Maya Tulip (2013). "A HISTORY OF RESIDENTIAL SEGREGATION IN BERKELEY, CALIFORNIA, 1878–1960" (PDF). The Concord Review, Inc.
- Parsons, Harriet, edited by David R. Brower, Sierra Club: A Handbook, "Mountaineering", Sierra Club, San Francisco, 1947, page 16