Refer to the input text as context and select the correct relationship between 'Fannie Mae' and 'Timothy Mayopoulos' from the available options.
Options: legal form, chairperson, chief executive officer, location of formation

Earlier this month, financial disclosures revealed that Fannie Mae CEO Timothy Mayopoulos and Freddie Mac CEO Donald Layton will each earn compensation of about $4 million.
chief executive officer