Peter Del Tredici is a botanist specializing in the growth and development of trees. He retired from the Arnold Arboretum of Harvard University in 2014 after working there for 35 years in a variety of capacities including Director of Living Collections. He taught in the Landscape Architecture Department at the Harvard Graduate School of Design from 1992 through 2016 and the Urban Planning Department at MIT from 2016 through 2019. He has published over a hundred scientific articles on a wide variety of subjects including, the ecology and taxonomy of hemlocks, magnolias and stewartias, the history of plant introductions from Japan and China, and the natural and cultural history of the Ginkgo tree. Since 2004, his research has focused on urban ecology and climate change, and in 2010 he published the widely acclaimed, “Wild Urban Plants of the Northeast: A Field Guide” (Cornell University Press; 2nd edition 2020).