He served on the boards of nonprofits including Metropolitan Career Center, Taller Puertorriqueno, and Lutheran Settlement House. A longtime member of Advent Lutheran Church in Richboro, Bucks County, he served in many capacities.
Mr. Weaver loved music and travel. He took his family to Europe, Central America, all over the United States, and Canada.
"Our girls just loved to travel, and he took it into their adult years," said his wife, the former Linda Hollinger.
He sang bass in the Voices Chorale and toured Germany with the chorus. He spoke German, having spent a year at the University of Muenster on a Fulbright travel grant before obtaining his doctorate at the University of Delaware in 1965. He also sang in the chamber chorus Cantus Novus, of which he was president.
Mr. Weaver enjoyed touring Longwood Gardens, Chanticleer, and Morris Arboretum. He was a vegetable gardener, and loved the birds and other animals in the wild. He also supported many environmental causes.
He was a volunteer science presenter at the Franklin Institute and a docent at the Philadelphia Zoo.
Besides his wife of 48 years, he is survived by a daughter, Sonya; a brother; and nieces and nephews. A daughter, Sara, died earlier.
A memorial service will be at 7:30 p.m. Sunday, Dec. 15, at Advent Lutheran Church, Second Street Pike and Worthington Mill Road, Richboro. A visitation starts at 6:30 p.m. Burial is private.
Memorial contributions may be made to the Nature Conservancy, Gift Planning, 4245 N. Fairfax Dr., Suite 100, Arlington, Va. 22203.