Langton was born in Boston, Massachusetts. She studied astronomy at Wellesley College and the University of Michigan, receiving a bachelor's degree in 1944. She received an M.A. in art history from the University of Michigan in 1945, and another M.A. from Radcliffe College in 1948. She studied at the Boston Museum School from 1958 to 1959.
In 1961 Langton wrote and illustrated her first book for children, The Majesty of Grace, a story about a young girl during the Depression who is certain she will some day be Queen of England. Langton has since written a children's series, The Hall Family Chronicles, and the Homer Kelly murder mystery novels. She has also written several stand-alone novels and picture books.
Langton's novel The Fledgling is a Newbery Honor book. Her novel Emily Dickinson is Dead was nominated for an Edgar Award and received a Nero Award. The Face on the Wall was an editors' choice selection by The Drood Review of Mystery for 1998.
Langton lives in Lincoln, Massachusetts, near the town of Concord, the setting of many of her novels. Her husband, Bill, died in 1997. Langton has three adult sons: Chris, David and Andy.
Series:
* Hall Family
* Homer Kelly Mystery