Patrick Sheridan graduated from the University of Maryland in 1986. His dissertation focused on chemical and physical characterization of the springtime Arctic haze aerosol, both by bulk chemical and individual particle analysis, and determining what could be learned about the composition, sources, etc., of the aerosol using each set of techniques. After graduation he moved to Boulder, CO, begin a two-year National Research Council postdoctoral fellowship at the NOAA Environmental Research Laboratories that involved additional Arctic fieldwork and analyses of Arctic air chemistry and meteorology data. Since January 1989, Dr. Sheridan has been employed as a Research Scientist at the Cooperative Institute for Research in Environmental Sciences (CIRES) at the University of Colorado in Boulder. He currently lives in Boulder with his wife Karen and daughter Hannah.