Foster will head the International Exhibitions division, which incorporates 15 shows including CMPi's ingredients trade events. Risby-Rose will take control of the Live Media sector, which boasts 25 exhibitions and includes the organiser's interiors events.
Foster and Risby-Rose will take up positions on the board.
The promotions are part of a company restructure involving the creation of four divisions, two predominantly magazine-related and two that are exhibition focused. One of the remaining divisions, Specialist Markets is being headed up by former editorial director Lindsay Cook.