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Auctioneer - the person conducting the actual auction. They announce the rules of the auction and the items being auctioned, call and acknowledging bids made, and announce the winner.
The auctioneer can sometimes just be the owner of the business, in this case they may hire a bid caller/s to announce the rules and call bids.
The auctioneer may operate his/her own auction house (and thus perform the duties of both auctioneer and auction house), and/or work for another house.
Auctioneers are frequently regulated by governmental entities, and in those jurisdictions must meet certain criteria to be licensed (be of a certain age, have no disqualifying criminal record, attend auction school, pass an examination, and pay a licensing fee).
Auctioneers may or may not (depending on the laws of the jurisdiction and/or the policies of the auction house) bid for their own account, or if they do, must disclose this to bidders at the auction; similar rules may apply for employees of the auctioneer or the auction house.