Refer to the input text as context and select the correct relationship between 'chief' and 'New York City' from the available options.
Options: location of formation, platform, legal form, owned by

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