Utilize the input text as a context reference, choose the right relationship between William MacAskill and University of Oxford 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.

University of Oxford professor William MacAskill set out to answer these very questions by taking an honest, evidence-based look at how we approach charitable giving.

Answer: employer