アテン群
His most notable discoveries include the potentially hazardous object and Aten asteroid 3362 Khufu, which he co-discovered with Maria A. Barucci, as well as the near-Earth object, Mars-crosser and Aten asteroid, 3551 Verenia. Together with Eleanor Helin he co-discovered the minor planets 3360 Syrinx, 6065 Chesneau, 6435 Daveross and 7163 Barenboim.