Bernard J. Tyson, CEO of Kaiser Permanente, has died at the age of 60.

Kaiser Permanente has announced through a statement that its CEO and chairman, Bernard J. Tyson, unexpectedly died in his sleep on November 10 at the age of 60.

The statement read:

It is with profound sadness that we announce that Bernard J. Tyson, Chairman and CEO of Kaiser Permanente, unexpectedly passed away early today in his sleep. On behalf of our Board of Directors, employees and physicians, we extend our deepest sympathies to Bernard’s family during this very difficult time. An outstanding leader, visionary and champion for high-quality, affordable health care for all Americans, Bernard was a tireless advocate for Kaiser Permanente, our members and the communities we serve. Most importantly, Bernard was a devoted husband, father and friend. We all will miss his tremendous presence in our lives.

Aside from being part of the company for more than 34 years, and serving as CEO since 2013, according to reports from Business Insider, Tyson also served on the boards of directors for the American Heart Association and Salesforce, as well as deputy chairman of the Americas for the International Federation of Health Plans and a steward of the World Economic Forum’s Global Challenge on the Future of Health and Healthcare.

The company’s board of directors named Gregory A. Adams, executive vice president and group president, as interim chairman and CEO.

Kaiser Permanente was founded in 1945 and it has a mission to provide high-quality, affordable health care services and to improve the health of communities around the country. It currently serves 12.3 million members in eight states and the District of Columbia.

Bernard J. Tyson with his wife, Denise Bradley-Tyson, 2017. Photo by Taylor Hill/FilmMagic via Getty Images.