The former director of the Barnes Foundation is crossing over to the commercial side of the art world. Derek Gillman, who led the Barnes’s controversial move from its original home in Merion, Pennsylvania to downtown Philadelphia, joined Christie’s on January 5 as chairman and senior vice president of Impressionist and Modern art, the Americas.

Gillman joins the auction house in the midst of a management shake-up. Last month, Christie’s chief executive officer Steven Murphy was replaced by Patricia Barbizet.