Utilize the input text as a context reference, choose the right relationship between 'Olivier Blanchard' and 'President' from the options.
Options: legal form, headquarters location, position held, owned by

Maurice Obstfeld, appointed a member of President Barack Obama’s Council of Economic Advisers in June 2014, will succeed Olivier Blanchard in September as the International Monetary Fund’s chief economist, the Washington-based institution said Monday in an e-mailed statement.
position held