Who is Tibbets from Canyons?

Tibbets is a Vietnam veteran and friend of Mr. Homesley's. As a pathologist, Tibbets becomes a great help to Brennan on his quest to discover the identity and cause of death for the skull he finds in the Canyons. With Tibbets' assistance, Brennan is able to narrow his research and find out information about the death of Coyote Runs.