What is the relationship between Glencore and Ivan Glasenberg 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.

LONDON—Collapsing commodity prices have forced one of the mining world’s most aggressive chief executives into retreat, pushing Glencore PLC’s Ivan Glasenberg on Monday to scrap the company’s dividend, issue more stock and sell assets.

Answer: chief_executive_officer