Colliers, a leading provider of diversified professional services in commercial real estate and investment management, has announced a significant personnel change. Tewfik Sabongui, the current CEO of the Czech branch of Colliers, will expand his competences and take over the management of the Slovak representative office of this important real estate company. Richard Urvay, the current managing director of Colliers in Slovakia, will leave his position by the end of April to take up a new role on the client side.