Kostas Kastanis is head of strategy at Upstream, a mobile marketing technology company. He joined Upstream in 2015 and since then has been instrumental in leading the strategic agenda of Upstream as well as managing its Corporate Communications function. Kostas is a graduate of the Athens University of Economics and Business in Operations Research, a MSc. degree holder in Decision Sciences from the same university and an MBA holder from INSEAD. Before Upstream, Kostas spent 8 years with McKinsey & Company, advising banking, telecom, industry and technology companies in Europe, Africa and Asia on financial, operational and organizational topics. He spent another 3 years with MasterCard, leading business development for Mobile Wallets in South-Eastern Europe.