Theatre Buildling Chicago announced today that its longtime executive director, Joan Mazzonelli, will leave July 31, thanks to a decision by the board to take the organization in a new direction. Spokesman Jeff DeLong said the situation “was resolved” last Friday, after months of discussion during which the board pushed for TBC to become more of a producing company, with a season of fully-staged shows built around the many musicals it nurtures through its workshops — a plan that would require a major boost in financial resources.

Mazzonelli joined TBC in 1985, and became executive director in 1997. Operations director Thom Van Ermen will take over most of her duties while the board conducts a search for a replacement.