What is the relationship between Tim Armstrong and AOL 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.

At the conference last summer, AOL CEO Tim Armstrong sat down with Verizon CEO Lowell McAdam, sewing the seeds for Verizon's $4.4 billion acquisition of AOL.

Answer: employer