He was previously chief executive officer of Bats Europe, which was bought by CBOE Holdings in February of 2017.  After BATS Global Markets acquired Chi-X Europe in November of 2011, he became CEO of the combined Bats Europe organization. 
Hemsley joined BATS in April of 2008 as a founding member and chief executive of BATS Europe, which launched in October 2008.
Hemsley is also a former Euronext.liffe executive and was named chief information officer of LIFFE in January 2001. In January 2002, he was promoted to managing director of LIFFE Market Solutions adding sales, marketing and commercial management to his CIO responsibilities.
From 2001-2004, he won contracts with top exchanges and transformed LIFFE's technology organization to capture greater revenue from its exchange businesses. A LIFFE board member, Hemsley was also heavily involved in the sale of LIFFE to Euronext, the predecessor company to NYSE Euronext.
Hemsley was also a managing director of global technology - serving as chief operating officer and a CIO - during his tenure at Deutsche Bank GCI. With the company, he managed teams of professionals in Frankfurt, London, New York, Singapore, Sydney and Tokyo, while working closely with the firm’s trading operations. His previous positions included time as a vice president at Credit Suisse-First Boston, where he was global head of foreign exchange technology, and a stint as CIO at Natwest Capital Markets.
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