Nature: Holdren, as is normal for US science advisers, has a background in physics. At the time of his appointment, two eminent biologists were named to co-chair the President’s Council of Advisors on Science and Technology (PCAST) with him. One will be Harold Varmus, the former director of the National Institutes of Health, who led Obama’s science advisory team during the campaign. The other is Eric Lander, founding director of the Broad Institute in Cambridge, Massachusetts, who helped lead the …