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.
Text: Glasenberg unable to 'read China' as Glencore slumps to huge loss Mining company Glencore's sharemarket float minted six billionaires in 2011, with Ivan Glasenberg and five other executives together controlling stakes worth $24 billion ($32.7 billion).
user
chief_executive_officer
assistant