CHICAGO (AP) — Chicago Tribune editor Gerould Kern is retiring and will be replaced immediately by the newspaper's editorial page editor, Bruce Dold.

The Chicago Tribune made the announcement Wednesday (http://trib.in/1SSLtns ). Chicago Tribune Media Group publisher and CEO Tony Hunter told employees in an internal memo that Kern led the newsroom "through years of change and evolution." Kern has been editor since 2008 and retires after 25 years with the company.

Dold earned the Pulitzer Prize for editorial writing in 1994. He's been with the Chicago Tribune since 1978 and editorial page editor for the last 16 years.

The shift comes amid other changes, including a new major shareholder in the newspaper's parent company. It received a $44 million cash infusion this month from an investor with a stake in the rival Sun-Times.