David Burton Van Vleck, 89, died on April 22, 2019, at his home in Cornwall. He was born July 11, 1929 in Montclair, NJ, the second of six children, of Joseph and Mary Van Vleck, where the family resided adjacent to his grandparents at 21 Van Vleck Street, and where with his beloved older brother Joe, he achieved great and constant mischief. When their family moved to West Hartford, CT, he attended Loomis School, and at sixteen, met Eunice Amelia Holt, by all accounts the most beautiful, sweetest girl in West Hartford. They dated until marrying in 1951, and remained so until her death on December 29, 2018. David and "Eunie" had three children: Carolyn, David Jr, and Sarah; and three treasured grandsons: Penn, Stokes, and Townsend. In 1951 Van Vleck matriculated at Princeton University, majoring in Economics and Sociology; earned Masters degrees at the School of Forestry at the University of Michigan, and Cornell University in Mammalogy, and a PhD in Vertebrate Zoology from Cornell in 1963, with a stint as a US Navy Meteorologist in Panama for two years during the Korean War. He taught at Loomis School 1954-1958, taught Comparative Anatomy and Human Anatomy as a graduate student at Cornell 1960-1963; and began his professional career as an assistant professor of Biology at the University of Miami 1963-1968 (teaching comparative anatomy and physiology, and human biology), followed by assistant professor of Biology at Middlebury College 1968-1972; director of Optimum Population in Charlotte, Vt, 1972-1974; and science/biology teacher at Middlebury Union High School 1974-1992, where he was affectionately known as "Doc", and was Chairman of the Science Dept, developed an Advanced Placement course of biology, and from 1979-1989 coordinator of a health program (drugs, sex education, nutrition) for grades 7-12; and sponsored Overpopulation Starvation Weekends for students to learn what starvation from food shortage really feels like, educating them to experientially think about the worlds future problems due to overpopulation. His publications included a book, How And Why Not To Have That Baby, as well as academic articles and essays on zoology and regarding the perils of world overpopulation (which, as he liked to point out, is the source of global warming, and future food, water, and oil shortages, likening our present society as partying while the room is on fire.) He was a frequent speaker on the subject of reproduction and population growth, and served on the board of the national organization Zero Population Growth. He founded the Addison County Planned Parenthood Clinic, was an avid member of the Lions Club, and Town and Gown Club; was the Cornwall town moderator for seven years, served eight years on the Addison County Regional Planning Commission, and five years on the board of the Addison County Audubon Society. Following retirement in 1992, his pursuits included an apple orchard, raising Black Angus beef with Daniel Rowe, growing wine grapes; and traveling the world including all seven continents: Africa, Norway, Italy, India, Antarctica and the Arctic. He took up painting, canvases depicting loons, landscapes, autumn trees, and Eunie and her dogs; he loved being outdoors, planting trees and blueberries, and chainsawing dead trees (leaving key latter ones for the use of birds); playing tennis with best friends, and socializing with best friends at Woodware; greatly enjoyed visiting his siblings children and their families; and spending time at the Forest Lake Club in Pennsylvania where he spent formative years with his siblings (and where some of his ashes will join those of his brother Joe in the Forest Lake.) A celebration of their lives will be held on June 15th, location to be announced. In lieu of flowers, donations to Planned Parenthood of Northern New England or the Vermont Land Trust, would be greatly appreciated. Thanks to Addison Home Health and Hospice for their kindness to both David and Eunice during their sunset days. Arrangements under the direction of Sanderson-Ducharme Funeral Home. Online condolences at www.Sandersonfuneralservice.com