Christopher McDonald Horne, who grew up in Alexandria and maintained family and friends in the area throughout his life, died Nov. 21, in an automobile accident while on vacation in San Juan del Cabo, Mexico. At the time of his death he was Director of the Summit School in Cashiers, N.C., where he had moved last August with his wife Mandy. Christopher was a gifted teacher, treasured friend, environmental steward, outdoor enthusiast, and dedicated community member. He was born Sept. 2, 1972, in Durham, N.C., to McDonald K. Horne, III, and Martha Johnston Horne. As a child and adolescent he was active in the youth groups at Christ Church, Alexandria. He was a 1990 graduate of the St. Stephen’s School in Alexandria and 1994 graduate of The College of William and Mary with a degree in biology. After graduating from college, Christopher taught mathematics at St. Stephen’s School for two years. He moved to Jackson, Wyoming, in 1997 to attend the Teton Science Schools’ Graduate Program, and returned to Jackson in 2001 after completing a master’s degree in environmental sciences at Antioch College of New England. Christopher was a founding faculty member of the Journeys School of Teton Science Schools, Wyoming’s first pre-kindergarten through 12th grade independent school. He was an inspired teacher of both math and science courses in the middle school, and he directed the entire middle school until the spring of 2007. Christopher is survived by his wife Amanda Hullander Horne, of Cashiers, N.C., and Apison, Tennessee, his parents, McDonald K. Horne, III, and Martha J. Horne of Alexandria, and his brother, Peter Horne, of Bellingham, Wash.