Utilize the input text as a context reference, choose the right relationship between Sergio Marchionne and Fiat 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.

John Rosevear TMFMarlowe Jul 16, 2015 at 3:25PM Fiat Chrysler CEO Sergio Marchionne spoke to leaders of the United Auto Workers union on Tuesday.

Answer: employer