Utilize the input text as a context reference, choose the right relationship between 'Airbnb' and 'Brian Chesky' from the options.
Options: original broadcaster, director/manager, founded by, legal form

Airbnb chief Brian Chesky was willing to sell a 10 per cent stake in his company for $150,000 in 2008 - it is now valued at around $US25b.
founded by