Tim Barclay, of Lincoln, Massachusetts, passed away peacefully at home on April 7th, 2026. He was raised in Scarsdale, New York, and spent his summers in Mantoloking, on Barnegat Bay in New Jersey.

Upon graduation from Princeton in 1951, Tim served three years in the Navy, including six months in Korea. In 1954, he was the navigator of the winning Navy Academy yawl “Lively” in the Newport to Bermuda sailing race. In 1959, he received his Ed.M in Science Education from Harvard University.

In his career, Tim was an enthusiastic science and math educator. He taught math and physical sciences at Darrow School in the Berkshires (1954–58) and at Commonwealth School in Boston (1958–71). In 1971, he became headmaster of Cambridge Friends School, a K–8 school.

As Sputnik spurred science and math curriculum reform in the early 1960s, Tim became an original member of the Elementary Science Study program at MIT, developing curriculum and teacher training. Starting in 1980, he worked at the Technical Education Research Center.

Tim was an active member of the Cambridge Friends Meeting, an avid writer, bird watcher, tennis player, sailor, baroque recorder player, and activist for environmental and social justice.

Tim was a warm and welcoming person who took an active interest in others.

He is predeceased by his first wife and mother of his four children, Ann Arter Barclay; his partner, Antonia Stone; and his second wife, Elizabeth Taylor.

He is survived by his four children, William, Mary, David, and Jeanne; his sister, Barbara Ritter; and five grandchildren.

Tim's memorial service to be announced. Burial in Lincoln Cemetery will be private. 

Tim requested that any gifts be made to organizations fighting climate change.

Arrangements under the care of Concord Funeral Home, 74 Belknap Street, Concord, MA 01742  978-369-3388  www.concordfuneral.com