Stevan J. Arnold is Professor Emeritus, Department of Integrative Biology, Oregon State University, USA. He was made a Fellow of the AAA&S (American Academy of Arts and Sciences) in 2009, and has held the presidency of both the Society for the Study of Evolution (1998) and the American Society of Naturalists (2012). He is one of the top experts in the field and has published large numbers of highly cited academic articles in the realm of quantitative genetics.