Don Williamson was a retired Reader in Marine Biology, University of Liverpool, UK. He founded the crustacean order Amphionidaceae and the larval transfer hypothesis that transforms ideas on the origins of larvae with far-reaching implications for evolution. His alma mater was King’s College, Newcastle- upon-Tyne, UK, formerly part of the University of Durham but now a separate university. He is, therefore, PhD (Durham), DSc (Newcastle-upon-Tyne). Don Williamson died on January 29, 2016. He actively communicated with filmmaker John Feldman during the production of Symbiotic Earth, reviewed the section of the film about hybridogenesis, and will be fondly remembered as a rigorous, open-minded, and ground breaking scientist.