The Whois entry for the domain name expedia.com says:

Expedia Inc

Host Master

13810 SE Eastgate Way Ste. 400

Bellevue, WA 98005

US

Phone: 425-564-7200

Fax..: 425-564-7240

Email: [email protected]

Hope this helps with the first part of your question. Can't help with the second one, I'm afraid - I know what I would do to obtain names of board members here in the UK (search the Companies House register) but I don't know how this works in the US.