In 1963 Ian McHarg and David A. Wallace, his academic colleague from the University of Pennsylvania, founded the firm of Wallace and McHarg Associates, later Wallace McHarg Roberts & Todd (WMRT) which is known for its central role in the development of the American environmental planning and urbanism movements. The seminal work of the firm includes the plan for Baltimore's "Inner Harbor", the "Plan for the Valleys" in Baltimore County, MD, and the "Plan for Lower Manhattan" in New York City from 1963 through 1965.