Ann Temkin will step down as chief curator of painting and sculpture at New York's Museum of Modern Art in January after roughly 18 years in the post, one of the most influential curatorial positions in contemporary art. Rather than retiring, she will become a strategic adviser to the museum, helping plan its centenary in 2029. During her tenure she organized major exhibitions including career surveys of leading modern and contemporary artists. Her departure opens a closely watched succession at MoMA's painting and sculpture department.