He retired from the Arnold Arboretum of Harvard University in 2014 after working there for 35 years as plant propagator, curator of the Larz Anderson Bonsai Collection, editor of Arnoldia, director of living collections, and senior research scientist. He was the 1999 winner of the Arthur Hoyt Scott Medal and Award, presented by the Scott Arboretum of Swarthmore College, and in 2013, he was awarded the Veitch Gold Medal by The Royal Horticultural Society (England) “in recognition of services given in the advancement of the science and practice of horticulture.” American Society of Consulting Arborists | 9707 Key West Avenue, Suite 100, Rockville, MD 20850