He’s Derek Gillman, 53, “president and chief executive of the Pennsylvania Academy of the Fine Arts, a prestigious art school and museum known for its collection of 19th- and 20th-century American paintings. Trustees at the Barnes cited Mr. Gillman’s experience with complex museum expansion projects, a familiarity crucial to the Barnes as it charts the move of its fabled collection of Impressionist and Post-Impressionist art from suburban Merion to a new building in downtown Philadelphia.”