Kenneth S. Deffeyes
Dr. Kenneth S. Deffeyes is a petroleum geologist.
"The dean of the older Hubbertians is Kenneth Deffeyes, Professor Emeritus at Princeton and author of Hubbert's Peak: the Impending World Oil Shortage (2001). Deffeyes, who worked with Hubbert in Houston for Shell Oil, says 'I never came to identify with management.' Convinced of Hubbert's theory, 'I realized that a contracting oil industry was not a good career prospect,' he says, 'so I decided to get out and go into academia' (Buterl, 2002). Besides, he thinks that 'crude oil is much too valuable to be burned as a fuel.' (Dunn, 2002)." 
- Beyond Oil : The View from Hubbert's Peak, Hill and Wang (March 15, 2005) ISBN 0809029561.
- Hubbert's Peak: The Impending World Oil Shortage, Princeton University Press (October 1, 2001) ISBN 0691090866.
- Kenneth Deffeyes' articles and interviews, Global Public Media website.