Summit Health Ltd., a Burbank-based operator of...

Summit Health Ltd., a Burbank-based operator of health-care facilities, appointed Glenn Sperry chief executive of Health Choice Arizona, a health maintenance organization.

Summit also said Mark Werber, in addition to being responsible for Summit’s three Arizona hospitals, was named regional vice president with expanded authority that includes Health Choice Arizona and the Davenport Medical Center in Iowa.

In addition, Jeffrey Ashin was named executive director of Mesa General Hospital Medical Center in Mesa, Ariz., Summit said.