Ann Marie Casey, who served for six years as the executive director of the Marblehead Chamber of Commerce, is now the executive director of the North of Boston Convention & Visitors Bureau. Starting this month, Casey will oversee marketing for 34 cities and towns in Essex County. “Ann Marie’s tenure was characterized by growth and improved programming for our business members. She shepherded the chamber through very challenging economic times and made this organization a stronger and more vital presence in our community,” said chamber board president Cindy Latham. Candidates interested in applying for the chamber’s executive director’s position may view a job description at www.marbleheadchamber.org .