Davor Mayer was appointed member of INA Management Board in February 2011. He started his career as an intern in INA Refinery Zagreb (today Maziva Zagreb) and Sisak Oil Refinery, after which he worked on INA refinery processing optimization and then in international trade. He served as the Petroleum Products Wholesale Manager in OMV from 1998 to 2002, when he took up a position in Tifon, becoming the head of the representative office of Gulf Oil International. From 2005 to 2008, he was the Industrial Manager for SEE in ExxonMobil. He started working in Tifon again in 2008 as a member of the Management Board and wholesales, procurement, logistics and card business manager, and in June 2009, he assumed the position of Fleet Card Management Sector Director in INA, alongside his seat in Tifon Management Board. He graduated from the Faculty of Chemical Engineering and Technology, and later on attended professional seminars and courses. He attended a postgraduate course on management systems at the Achieve Global international school in Brussels, Belgium, from 2005 to 2008.