Paul has committed his professional architectural career to designing dwellings, mixed-use buildings, and neighborhoods in ways that optimize environmental and social conditions. With his San Francisco-based firm Okamoto Saijo Architecture (OSA), he designs custom passive solar residences, affordable housing developments, community-based neighborhood plans, and researches on sustainable design issues. Paul is a licensed California architect and has a LEED Professional Accreditation with the U.S. Green Building Council. He received his Bachelor of Architecture from the California Polytechnic State University, San Luis Obispo, CA, in 1981, and his Master of Architecture from the University of Adelaide, Australia, in 1988. He was a Loeb Fellow during 2000-2001.