An interview with Lewis Wolpert.

Lewis Wolpert is a retired developmental biologist who, over his long career, has made many important contributions to the field, from his French Flag model and the concept of positional information to the famous quote that it is "not birth, marriage or death, but gastrulation which is truly the most important time in your life." In addition to his scientific contributions, Lewis is also a prolific writer, from the textbook 'Developmental Biology' to books about popular science, religion and his battle with depression. Although born in South Africa, it was in the United Kingdom that Lewis spent most of his scientific career. We met Lewis at the Spring Meeting of the British Society for Developmental Biology, where he was awarded the Waddington Medal.