UnitedHealth
McGuire joined United HealthCare in November 1988 as an executive vice president when the Peak Health Plan, of which he was then president and chief operating officer, was acquired by United. In May 1989, he was appointed to the board of directors and became chief operating officer of United. In November 1989, he became president of the company, a position he held until May 1991. He was named chief executive officer in February 1991, and chairman of the board of directors in May of the same year.
When McGuire joined United, it was an unprofitable regional health maintenance organization with annual revenues around $400 million. When he left, United was one of the largest, most profitable, and most diversified healthcare companies in the world, with more than $70 billion in annual revenues, more than 50,000 employees, and more than sixty million health plan members.
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