Irvine-based Golden State Foods, one of Orange County’s largest private companies, said Chairman and Chief Executive Mark Wetterau has died after 25 years at the helm. He was 65 years old. Conrad Wetterau, Mark’s brother, business partner, and 25-year GSF Board Member, has been elected to serve as GSF’s Chairman of the Board of Directors, effective immediately. Conrad Wetterau and Mike Waitukaitis are both co-owners of Wetterau Associates, GSF’s purchaser in 1998.