NAI Avant has promoted Elizabeth Killen to director of marketing and public relations. Killen previously served as the marketing coordinator and brokerage assistant for the Columbia office. In her new role, she will manage the marketing and public relations plans and communication. In addition, Killen will manage the website, social media, event planning and brand standards for both the Columbia and Charleston offices. The firm also has promoted Stacy Pinkney to property accountant for the Columbia headquarters. Pinkney previously served as staff accountant for NAI Avant. In her new role, she will handle proper accounting of third-party properties and payroll processing.