Armand Marie Leroi was born on 16 July 1964 in Wellington, New Zealand. A Dutch citizen, his youth was spent in New Zealand, South Africa and Canada. He was awarded a Bsc. by Dalhousie University, Halifax, Canada in 1989, and a Ph.D. by the University of California, Irvine in 1993. His doctoral work was supervised by Michael Rose and concerned the genetics of ageing in fruit flies. This was followed by postdoctoral work at the Albert Einstein College of Medicine, New York, in Scott Emmonsıs laboratory. Here he began to work on growth in the nematode worm, Caenorhabditis elegans, and its relatives. In 1996 he was appointed Lecturer at Imperial College London; in 2001, Reader in Evolutionary Developmental Biology. He lives in London.