Professor horticulture and agricultural botany New York State School of Agriculture, Morrisville, 1909-1914. Professor horticulture Syracuse University College Agriculture, 1914-1917. Assistant in visual instruction agricultural, States Relations Service, Washington, 1917.
Director agricultural courses National Service School, Washington, summer, 1918. Organizer and inspector of camp farms, O.Q.M.G., 1918. Lecturer in horticulture Advertising Educational Foundation, Beaune, France.
1919; lecturer horticulture Columbia University, 1925-1927, associate professor landscape architecture, 1927-1945, now emeritus. Director Hamilton Arboretum and Gardens, Nevis, Irvington-on-Hudson, New York.