Thomas is Non-Executive Chair of the Board of The International Stock Exchange Group Limited, serving as a non-independent Non-Executive Director of the Company since June 2025.

Background, Experience and Skills

Thomas is one of the principal founders of Miami International Holdings, Inc. (MIH) and has served as the Chairman of the Board of Directors of MIH and the MIAX Exchanges since 2008.  Thomas has been serving as the Chief Executive Officer of MIH and the MIAX Exchanges since 2012. He was a founding partner of the law firm Gallagher, Briody & Butler, a corporate and securities law firm located in Princeton, New Jersey, and was associated with the firm until joining MIH full time in December 2012.  

Thomas has been a director of MIAX Futures Exchange since October 2019, becoming Chairman of the MIAX Futures Board of Directors in June 2021. He has also been a member of the BSX Council since July 2019, becoming Chairman of the BSX Council in February 2020. Thomas is also the Chairman and Chief Executive Officer of the following subsidiaries of MIH: MIAX Technologies since May 2010; MIAX Products since January 2019; MIAX Global since June 2015; M 402 Holdings since July 2020; M 7 Holdings since December 2022; and Dorman Trading since October 2022. He is also the Chairman of M 9 Holdings since February 2008, becoming Chief Executive Officer in May 2024. He is also the Chairman of MIAXdx since June 2023. He is also a director of MIAX Global Derivatives and MIAX Futures Real Estate Holdings. Thomas is the Chief Executive Officer and a director of MIH East Holdings.

From 2005 to 2014 Thomas served on the Board of Trustees of The Hun School of Princeton and is currently a Trustee Emeritus.