Dominic Casserley, president and deputy CEO of Willis Towers Watson, will leave the company when his employment agreement ends on Dec. 31, 2016, the global advisory and broking company confirmed on Tuesday.

Casserley took his present position in January 2016 when Willis and Towers Watson merged. Prior to that he was CEO of Willis Group, a position he had held since he joined the broker in January 2013.

“I have been honored to lead Willis for three years, and to help build Willis Towers Watson this year,” Casserley said in a media statement, which noted that the total return to Willis shareholders was 58 percent during his tenure as CEO.

The statement also noted that from 2013 to 2015, Willis advanced its core organic “Analytical Broker” and “Connecting Willis” strategies, introduced industry specialization, deepened its broking capabilities and reengineered many core processes, while at the same time growing inorganically. Highlights of inorganic growth initiatives included executing a partnership with Miller in London, completing the acquisition of Gras Savoye, and expanding health care advisory and brokerage capabilities.

Since January, at the merged Willis Towers Watson, Casserley was a member of the board. He co-led the integration process and was head of one of the global business segments, Investment Risk and Reinsurance.

WTW CEO John Haley thanked Casserley particularly “for his partnership and tireless efforts in achieving the creation of Willis Towers Watson,” starting with their initial discussions in early 2015 through the deal close in January 2016, and for Casserley’s efforts this year in driving the integration forward. “Dominic has started us on the journey towards realizing the full potential and benefits of Willis Towers Watson for our clients, colleagues and shareholders,” Haley said.

In the same media statement, Jim McCann, formerly the Willis Group Chairman, and now the Chairman of Willis Towers Watson, credited Casserley with leading “the evolution of Willis into a global, analytical professional services organization,” as well as “the bold expansion of the Willis franchise around the world,” adding that Casserley was “crucial to the design, negotiation and success of the Willis Towers Watson merger.”

Said Casserley: I have great confidence that the leadership team will carry Willis Towers Watson forward to new heights,” going on to thank clients, markets, colleagues, board members and shareholders for their support throughout in recent years.

Source: Willis Towers Watson