Utilize the input text as a context reference, choose the right relationship between chief and New York City from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

She was previously chief program officer for mental health at the New York City Department of Health and Mental Hygiene.

Answer: location_of_formation