He was previously an Andrew W. Mellon Fellow in the Humanities Institute at the New York Botanical Garden, and his principle scholarly interest concerns the historical, scientific, cultural, and design bases of urban greening – defined here as the introduction or conservation of outdoor vegetation in cities. Theodore’s career spans research and practice with a range of federal, municipal, and nonprofit organizations. He has been a regular contributor to Landscape Architecture Magazine on ecological design topics and is currently a review editor for the urban ecology section of Frontiers in Ecology and Evolution. Raised in Sweden and the United States, and having worked as a Peace Corps Volunteer in Senegal, he is also interested in international affairs.