In the context of the input sentence, determine the relationship between 'Glencore' and 'Ivan Glasenberg'.
Options: publisher, chairperson, chief executive officer, creator

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).
chief executive officer