hathaway-dinwiddie
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Greg Cosko
Greg Cosko is the Executive Chairman (and longtime President & CEO) of Hathaway Dinwiddie Construction Company, one of California's oldest builders. He led the Getty Center build, engineered the 1996 management buyout and merger that formed Hathaway Dinwiddie, and spent nearly three decades steering a 510-person, employee-oriented firm with roughly $300M in annual revenue.
Kevin O'Riordan
Kevin O'Riordan is President and CEO of Hathaway Dinwiddie Construction Company, the 117-year-old, employee-owned San Francisco general contractor behind a generation of California's most photographed buildings. He took the top job on April 1, 2025 after four decades in the trade and five years running the Northern California region. In the same window he was elected 2025 President of the Construction Employers' Association.