Mark, Andy: - Andy Mark worked as a brakeman and conductor on the Western Pacific and Union Pacific Railroads for twenty-one years before going back to college. A graduate of CSU-Chico, he spent sixteen years as a statistical consultant and data analyst before retiring in 2013. He is the author of two published articles, as well as a book on local history titled The West Branch Mill of the Sierra Lumber Company. Andy enjoys hiking in the backcountry, and he and his wife, Jill, are longtime rock hounds.