what was one of the former job of alvin dewey

I actually went to a page about the Alvin Dewey's life. I knew he was a police dispacher but here is a little more. I'll site the source below.

After graduating from Garden City Community College, Dewey took a job as a police dispatcher in town. He later went back to school, studying police administration at San Jose State (Calif.) College, then working for the Kansas Highway Patrol for two years. He spent five years at the Federal Bureau of Investigation before serving as Finney County Sheriff for eight years. He joined the KBI in 1955.