David H. Long

Long received his BA in mathematics from Hartwick College in 1983. He received a master's degree in 1989 in finance from Boston College. In 1985 Long was hired by Liberty Mutual Insurance Group as a financial analyst in National Accounts.

Long started with Liberty Mutual in 1985 and has held positions in areas of underwriting and financial, mergers and acquisitions, international operations, and commercial markets during the thirty-three years he has been with the company. Among his titles are president, executive vice presidents, of Commercial Markets; and chief operating officer in National Markets. He is also a founding member of Liberty Mutual Agency Corporation. He was an active participant in the company's acquisition of Golden Eagle, Peerless Insurance, Summit, Colorado Casualty and Indiana Insurance. He retired at the end of 2022. In January 2023, Timothy M. Sweeney took over as President & CEO. In April 2025, Long resigned as chairman and Director.

Long is married to Stephanie Isgur Long, a fellow Hartwick graduate.

Long owns a $2.3 million 5,700-square-foot home on the island of Nantucket. In 2018, he hired a lawyer from Mintz, Levin, Cohn, Ferris, Glovsky, and Popeo to lobby state environmental officials to block the building of a dormitory for seasonal employees of the Miacomet Golf Course.

Long has focused on charitable initiatives geared toward individuals on the autism spectrum. His wife is the president of The Common Room, a social club for young adults with ASD. He also founded a pasta company that employs individuals with ASD.