TA Associates was founded in 1968 by Peter Brooke with the backing of his former firm, Tucker, Anthony & RL Day, an investment banking and brokerage firm. Prior to founding TA, from 1963 to 1968, Brooke had headed the corporate finance and venture capital activities of Tucker Anthony. Previously, Brooke had been responsible for expanding the private equity activities of Bessemer Securities and had founded the High Technology Lending Group of First National Bank of Boston. At the time it was founded, the firm focused primarily on making venture capital investments in earlier stage companies.