 In the early 2000s, Halley was an active teacher in the graduate art programs at Columbia University, UCLA, and Yale University.In 2002, he became director of the Graduate Painting and Printmaking program at the Yale School of Art, where he served until 2011.From 2010 to 2011, he was appointed as an endowed chair, the Leffingwell Professor of Painting, at the Yale University School of Art.