What is the relationship between Joe Kaeser and Siemens 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.

Siemens Chief Executive Joe Kaeser described the dilemma last month, explaining why Siemens continued to partner with Shanghai Electric despite the Chinese company's having become more of a direct competitor.

Answer: employer