Kaiser Permanente Hawaii is changing its top officer.

The state’s largest health maintenance organization said Friday that President Janet Liang has been promoted to chief operating officer of Kaiser’s Northern California Region. She will be replaced by Mary Ann Barnes, who will oversee the 278-bed hospital, 20 medical facilities and 4,000 employees in the Hawaii Region.

Barnes is currently senior vice president and executive director for Kaiser Permanente San Diego, which includes a 414-bed acute care hospital and 24 medical offices.

 In Hawaii, Barnes will work closely with Executive Medical Director Geoffrey Sew-ell, who oversees more than 400 physicians in the Hawaii Permanente Medical Group. 

Liang, who joined Kaiser Hawaii in 2007, and Barnes both will begin their new roles in June.