Adam Chinn to leave Sotheby's after chief operating officer role is 'eliminated'
Former deal-maker, who joined the auction house in 2016 with the acquisition of Art Agency, Partners, will leave on 31 December
Guarantees: the next big art market scandal?
Third-party auction deals have made some people very rich—but they may be bad for the market in the long run
Common mistakes of rookie auction guarantors
Guarantees can be lucrative, but in the face of savvy competition, novices can get burnt when backing works as a third-party