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Grennan was born and raised in the Finger Lakes region of Upstate New York. He has worked in journalism for five years in New York and Washington D.C. reporting on environmental concerns like climate change and pollution. Throughout this period he also worked as a touring musician and had stints in Europe and Tanzania. Grennan enjoys reading, watching his favorite soccer teams lose, and long distance running. He recently finished a hiatus from journalism spent making beer and getting his M.A. from the Climate and Society program at Columbia University. Follow him on Twitter: @NotGrennan