One of the most famous, alleged purveyors of label fraud is wine collector Hardy Rodenstock. In the 1980s and 1990s, Rodenstock hosted a series of high-profile wine tasting events of old and rare wines from his collection, including many from the 18th and 19th centuries. He invited to these tastings dignitaries, celebrities and internationally acclaimed wine writers and critics such as Jancis Robinson, Robert M. Parker Jr. and Michael Broadbent who at the time was a director at the London auction house Christie's and considered one of the world's foremost authorities on rare wine. At one such tasting, Rodenstock produced 125 vintages of Château d'Yquem, including a very rare bottle from the 1784 vintage. In addition to holding these extravagant tastings, Rodenstock also sold many bottles from his collection at auction houses, which supposedly regularly inspect and research wines for authenticity. One such lot that Rodenstock sold were the rare "Jefferson bottles", reportedly rare Bordeaux wines bottled for the American president, Thomas Jefferson. American businessman Bill Koch bought four of these Jefferson bottles which were later determined to be fake - the engravings on the bottle that purportedly linked them to Jefferson were determined to have been done with a high-speed electric drill similar to a dentist's drill; technology that did not exist until modern times. This revelation cast a net of suspicion on the authenticity of all the rare bottles that Rodenstock served at his tastings and sold at auctions.