A Lawrence city commissioner is taking charge of Leadership Lawrence, a leadership and community-building organization run by the Lawrence Chamber of Commerce.

Hack, herself a 2000 Leadership Lawrence graduate, has agreed to serve as interim executive director, chamber officials said Thursday. Hack will oversee volunteers for an upcoming class of 25 participants.

The move comes as Nancy Longhurst, the program’s longtime executive director, is resigning to pursue other interests, effective Wednesday. Her departure convinced the chamber to postpone plans for increasing this year’s class size from 25 to 50.

Program participants, or their employers, each pay $1,000 to take part in the eight-month program. The program’s first class graduated in 1983; now there are 427 Leadership Lawrence alumni.