What is the relationship between Satya Nadella and Microsoft in the context of the input sentence. Choose an answer from: 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.

Seated with Obama and Xi at the head table were Apple (AAPL.O) CEO Tim Cook, Satya Nadella of Microsoft (MSFT.O), Facebook's (FB.O) Mark Zuckerberg and Salesforce.com's (CRM.N) Marc Benioff.

Answer: employer