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After two years at the helm, Robert W. Heidt Jr. recently resigned as chief executive officer of the Cape Ann Chamber of Commerce, effective Oct. 1. Heidt said he is leaving to become president and chief executive of the Glendale Chamber of Commerce in Arizona. Senior vice president Peter Webber will oversee chamber operations until a replacement is hired. Board president Ed Collard will head a search committee for the organization’s next chief executive officer.