Chris Christensen, 87, has not been seen since about 5 p.m. Tuesday when he left his home near Graton, according to the Sonoma County Sheriff's Office. Christensen has dementia and Parkinson's disease ...

The Sonoma County Sheriff’s Office is seeking the community’s assistance in locating a missing 87-year-old man considered at risk due to dementia and Parkinson’s disease. Chris Christensen was last ...

Chris Christensen described case method teaching as "the art of managing uncertainty"—a process in which the instructor serves as "planner, host, moderator, devil's advocate, fellow-student, and judge ...