Troy is principal and co-founder of the environmental consultanct Spatial Informatics Group, LLC. He is also a fellow of the Gund Institute of Ecological Economics and co-principal investigator of the Baltimore Ecosystem Study, one of the National Science Foundation's two urban Long-Term Ecological Research projects. He served for four years as a planning commissioner for the city of Burlington, VT. He is the author of The Very Hungry City, published in 2012, and numerous articles.