Julien Derr has a multidisciplinary background. Trained at ESPCI Paris, he started his career in solid state physics (working on quantum phase transitions, and silicon nanocrystals) before being interested by biophysics. He is generally interested in the concepts of self-organization. He has in particular been working on self-organization of proteins or RNA bases. Since 2010, he is “maitre de conférences” at université de Paris Diderot where he is interested in morphogenesis. He wants to understand pattern formation mechanisms, in living organisms, plants or also geophysical context.