Timothy A. Cohn

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Timothy A. Cohn (1957 - ) is a hydrologist with the US Geological Survey, USGS Science Advisor for Hazards (1998-2001), and lecturer at Johns Hopkins University (2006 - ). Cohn served in the office of Senator Bill Bradley (D-NJ) in 1995-97 as a AAAS Congressional Science Fellow, and worked on the unsuccessful Bradley presidential campaign in 2000. Since 2005, Cohn has been a member of the Governing Board of the American Institute of Physics.

Cohn's research has focused on flood frequency analysis, estimation of nutrient transport in rivers, and the interpretation of trends in hydroclimatological data. Cohn's most controversial research, which has not been fully embraced by the climate science community, suggests that the significance of climate trends may be greatly overstated because it does not consider the possibility of long-term persistence in climate processes.

Cohn holds a B.A. in mathematics from Swarthmore College (1979) and M.A. (1984) and PhD (1986) degrees in water resource systems from Cornell University.