His latest book, A French Kiss with Death , chronicles the making of Steve McQueen's film Le Mans .

Throughout the 1970s, Keyser was a regular competitor on the FIA endurance circuit and in the IMSA Camel GT series, where he scored numerous wins, including a victory at the 12 Hours of Sebring with Al Holbert in 1976. He was known best for his yellow and black Toad Hall Porsche RSRs, although he later switched to a Chevrolet Monza.

For the past ten years Keyser has operated Autosports Marketing Associates, Ltd. in Butler, Maryland where he lives with his wife Beth.