Daniel H. (Don) Callahan is an Executive Partner at Bridge Growth Partners and acknowledged internationally as a leader in both the financial services and technology industries.
Prior to retiring in 2018, Mr. Callahan was the Chief Administrative Officer and Global Head of Operations and Technology at Citigroup. He now serves on the boards of Tata Consultancy Services, Ltd., WEX Inc., Scotiabank and Kore.ai. Additionally, as CEO of Callahan Advisors LLC, he advises global companies with their digital transformation and technology start-ups with differentiated growth strategies.
At Citigroup, Mr. Callahan managed a complex set of businesses and services spanning more than 100 countries, a multi-billion-dollar operating budget and critical systems infrastructure including the bank’s cyber security initiatives. He led a top-to-bottom transformation of operations and technology, helping move the global bank from a collection of independent and dispersed entities into a lean, fully integrated enterprise. Mr. Callahan also established globally consistent technology standards and governance, and migrated critical functions to an integrated, managed, shared services model. As a result, in 2017, Citi was named by the Gartner Group as the most efficient of all major global banks in generating income per dollar of IT spending.
Earlier in his career, Mr. Callahan served in senior executive positions at Morgan Stanley and Credit Suisse and spent 12 years at IBM, where he held several management positions, including director of strategy for IBM Japan.
He serves as the non-executive chairman of TIME, where he is leading a comprehensive digital transformation of this iconic media brand. He is also on the business committee of the Metropolitan Museum of Art, a fellow at the Foreign Policy Association and on the boards of Columbia University Teachers College and NYU Stern – Andre Koo Tech MBA Advisory. He holds a bachelor’s degree in history from Manhattanville College, where he serves as trustee chair emeritus.