Gui Rochat (Guillaume Frédéric Rochat, born 1933) is an international private art dealer and consultant, dealing primarily in seventeenth- and eighteenth-century French paintings and drawings, working from New York as "Gui Rochat Old Masters". His long experience with four art auction houses, Sotheby's, Phillips, Son & Neale, Butterfields (now Bonhams) and Doyle New York has given him the background for rescuing a number of Old Master paintings from oblivion. He is proud to have Antoine Le Grand Batard de Bourgogne (1421-1504) *, painted by Rogier van der Weyden as well as by Hans Memling, as a direct ancestor.