Utilize the input text as a context reference, choose the right relationship between Ryanair and Michael O'Leary from the options. Options: 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.

Michael O'Leary has insisted he would be at the controls of Ryanair for years to come and scotched suggestions the Irish airline's financial success could trigger takeover interest.

Answer: chief_executive_officer