What is the relationship between was and HarperCollins 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.

As we had indicated on previous calls, the second half of the fiscal year at HarperCollins was more propitious than the first half, with segment EBITDA improvement in both Q3 and Q4.

Answer: publisher