Vallejo man whose book on fire/arson investigation is most studied, to retire

When it comes to fire forensics, 33-year Vallejo resident John DeHaan, literally wrote the book -- the textbook that is most used nationwide by those going into the field of arson investigations.

Basically, DeHaan is a real Sherlock Holmes, surrounded by books, pamphlets and plaques, in his unassuming offices on Georgia Street downtown Vallejo.

Vallejo man whose book on fire/arson investigation is most studied, to retire