UnitedHealth Group CEO and leadership

Tom Roos was appointed chief accounting officer for the enterprise in August 2015. He is responsible for SEC reporting, accounting policy, tax and enterprise risk management. Previously, Roos was a partner at Deloitte & Touche LLP for eight years, where he worked closely with Deloitte & Touche's national office and industry leaders on emerging technical accounting and reporting matters in the health insurance industry, with experience in company mergers and acquisitions and initial public offerings.

Dirk McMahon was named president and chief operating officer, UnitedHealth Group, in February 2021, in addition to his role as chief executive officer of UnitedHealthcare. He is a member of UnitedHealth Group’s Chief Executive Office.Dirk McMahon was named chief executive officer, UnitedHealthcare, in June 2019. Prior to this role, McMahon was president and chief operating officer, Optum, with responsibility for driving Optum's enterprise performance overall and directly overseeing OptumInsight, Optum Technology, Operations, Optum Administration and business and corporate strategy. In 2017, McMahon was named to the Office of the Chief Executive. Previously, he was executive vice president, Enterprise Operations, UnitedHealth Group. McMahon has served in a number of leadership positions across the enterprise since joining the company in 2003, including chief executive officer, OptumRx, overseeing UnitedHealth Group's pharmacy benefit management programs, along with various management positions in information technology, operations and finance. Before joining UnitedHealth Group, McMahon was head of airport operations worldwide for Northwest Airlines.

Patricia Lewis was appointed executive vice president and chief human resources officer, UnitedHealth Group, and was named a member of the Office of the Chief Executive in October 2019. She is responsible for overseeing all aspects of human capital, including compensation and benefits, talent management, leadership and employee development, rewards and recognition and organization development. Lewis joins UnitedHealth Group from Lockheed Martin, where she was senior vice president and chief human resources officer, leading a large global team to deploy a human capital strategy in support of a diverse global workforce in more than 50 countries. She has successfully led human capital teams within complex and highly regulated industries spanning aerospace, defense, energy, cybersecurity, data analytics, biometrics, technology and chemicals. Prior to joining Lockheed Martin in 2011, Lewis held various positions in Human Resources at IBM and DuPont.