Don Callahan, current Board Member of Accedian, is the former Citigroup Chief Administrative Officer. Responsible for the global bank’s operations and technology functions, Mr. Callahan was a member of Citi’s operating committee until his retirement in December 2018.

Prior to joining Citi in 2007, Mr. Callahan held senior executive positions at Morgan Stanley, Credit Suisse and IBM Japan. As Citi’s head of operations and technology, Don played a key role in transforming Citigroup’s geographically diverse and loosely aligned functions into a lean, globally integrated enterprise.

Mr. Callahan currently serves on the boards of Tata Consultancy Services LTD and WEX, Inc. (NYSE: WEX) as well as several other private companies. He also serves on the board of the American Red Cross Greater New York Region, the business committee of the Metropolitan Museum of Art, and is a fellow at the Foreign Policy Association. Mr. Callahan holds a bachelor’s in history from Manhattanville College where he serves as Chairman Emeritus.