"Exhilarating and informative ... Mr. Costamagna is catholic in his enthusiasm and is open to the new. He tells delicious stories." It's a rare and secret profession, comprising a few dozen people around the world equipped with a mysterious mixture of knowledge and innate sensibility. Summoned to Swiss bank vaults, Fifth Avenue apartments, and Tokyo storerooms, they are entrusted by collectors, dealers,...
--The Wall Street Journal