Originally trained in mathematics and art, Sönke Johnsen has studied camouflage, signaling, and non-human visual modalities for the last 27 years. He is particularly interested in vision and camouflage in the open ocean, but has also worked on coastal and terrestrial species, magnetoreception, nocturnal illumination, and human cataracts. His research combines mathematical analyses with behavioral and morphological studies and in situ measurements and observations. His field work primarily involves open-ocean research cruises that use SCUBA and deep-sea submersibles. In addition to exploring the evolution and diversity of the optical and visual tricks that animals perform, Professor Johnsen is interested in improving communication between theoretical and experimental scientists and between scientists and artists. Outreach is a strong focus and his research has been presented in numerous magazines, newspapers and television shows. Professor Johnsen has also written two books, The Optics of Life and Visual Ecology, and is currently working on a third for a lay audience. In his spare time, he is an avid nature photographer and amateur farmer.