Daniel (Don) H. Callahan

Daniel (Don) Callahan is a corporate director and the former Chief Administrative Officer and Global Head of Operations, Technology and Shared Services of Citigroup. From 2007 until his retirement in December 2018, 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. Prior to joining Citigroup, Mr. Callahan held various senior executive positions at Morgan Stanley and Credit Suisse. Earlier in his career, he spent 12 years at IBM, where he held a number of management positions, including Director of Strategy for IBM Japan. Mr. Callahan holds a B.A. in history from Manhattanville College, where he serves as Trustee Chair Emeritus.

• Environmental, social, and governance (ESG) matters
• Financial services
• Human capital management and executive compensation
• Risk management
• Technology

• Director since June 15, 2021
• Member of Risk Committee and Technology Committee
• Independent

• WEX Inc.