(Submitted photo)A diagram of Ken Mattson’s auto accident on Aug. 29, 2025, as pictured in a California Highway Patrol crash report. Robbi Pengelly / Sonoma Index-Tribune file Ken Mattson at the Sonoma City Council meeting Jan. 14, 2019. His suspected injuries were “minor,” according to the crash report. Ken Mattson’s civil attorney, Reno-based Micheline Fairbank of Fennemore Law, declined to comment. Since then, the company they formed together, LeFever Mattson Inc., as well a separate company controlled by Ken Mattson, KS Mattson Partners, have been beset by lawsuits and bankruptcies.