Utilize the input text as a context reference, choose the right relationship between 'chief' and 'New York City' from the options.
Options: location of formation, owned by, legal form, platform

Mr Murdoch is a big admirer of Joel Klein, Amplify’s chief executive and the former head of education for New York City but the potential sale or winding down of News Corp’s involvement suggests that there are limits to that admiration.
location of formation