On December 15, 2017, David Dockhorn, Executive Vice President and Corporate Compliance Officer of PRA Health Sciences, Inc. provided notice of his intent to retire from PRA, effective March 30, 2018. Mr. Dockhorn will assist the company in transitioning his responsibilities to other executive officers through the date of his departure. Mr. Dockhorn's retirement is due to his desire to spend more time with his family and personally recharge, and not due to any disagreement with the Company on any matter related to PRA's operations, practices or policies.