Brian O’Sullivan has spent most of his career in the investment management industry. He retired in June 2020 from his role as Chief Operating Officer of a specialist asset manager, Thomas Miller Investment. Previously he was a Senior Vice President at State Street Bank, and has held senior roles in a number of financial institutions.

Brian graduated in 1975 from Queen Elizabeth College, London (now part of King’s College). He later completed MA and PhD degrees with Birkbeck, London.

He is a Fellow of the Institute of Chartered Accountants (FCA) and a Fellow of the Association of Corporate Treasurers (FCT).

His research interests are mainly twentieth century economic and financial history. His book From Crisis to Crisis: The Transformation of Merchant Banking, 1914–1939 was published by Palgrave Macmillan in 2018. It was jointly awarded the 2019 BAC Wadsworth Prize, being judged to have made an outstanding contribution to the study of British business history.

In November 2020, Brian was appointed a Trustee and the Honorary Treasurer of the Business Archives Council.