Kaarina Koskenalusta, the president of the Executives’ Club of Chicago, resigned the post she had held for 25 years, the club announced in a press release distributed late Friday.

Koskenalusta is leaving to become a principal at the Dilenschneider Group, working from Chicago and New York, according to the club’s release. She will be in charge of global client relationships.

The club will work with executive search firm Russell Reynolds to find a new chief executive. In the interim, Mary MacLaren, the club’s chief of staff from May 2009 to July 2010, will serve as interim CEO.