Toronto-based Praxis has promoted Liz Luzza to the position of vice-president. Since joining the agency in 2002, she has worked on accounts including E & J Gallo Winery, PepsiCo Beverages Canada, Beam Canada and Carstar Automotive Canada. Margaret Antkowski, who joined the firm in 2011, has been promoted to senior account director. She has worked on accounts including Beam Canada, Quaker Canada and Lasik MD.