Dr. Susan Strahan is a Principal Scientist with the Universities Space Research Association. She joined USRA in 2011 and has worked as an atmospheric scientist at NASA Goddard Space Flight Center since 1992. She received her Ph.D. in chemistry in 1986 at the University of California Berkeley. Before coming to Goddard she made stratospheric trace gas measurements using an instrument on the high-flying NASA ER-2. She is an international leader on ozone studies, using atmospheric measurements and NASA models to characterize and quantify stratospheric transport and chemical processes in the ozone layer. Her recent studies used observations to conclusively attribute Ozone Hole recovery to the Montreal Protocol. She is on the Steering Committee of the Network for the Detection of Atmospheric Composition Change (NDACC) where she provides model simulations and analysis to NDACC instrument teams.