John Talley joined the Delaware Geological Survey (DGS) as a project geologist in 1972, became a senior scientist and hydrogeologist by 1986, and rose to director and state geologist by 2004. He’s consulted with dozens of university, state, and federal governments and groups and amassed a list of more than 50 publications and reports.

http://www.dgs.udel.edu/profile/john-h-talley