Karl Deisseroth is associate professor of bioengineering and psychiatry at Stanford University. Deisseroth created optogenetics, a technology that uses light to precisely control and tune brain activity. His group is now extending this technology to probe the dynamics of neural circuits in health and disease. As a practicing psychiatrist, Deisseroth also employs brain stimulation for therapeutic purposes. His group uses a wide range of techniques including optics, stem cell and tissue engineering, electrophysiology, genomics, animal behavior, and computational network modeling. He has received numerous awards including the National Institutes of Health Director’s Pioneer Award, the Presidential Early Career Award for Science and Engineering (PECASE), the McKnight Foundation Technological Innovations in Neuroscience Award, the Coulter Foundation Early Career Translational Research Award in Biomedical Engineering, and the Brilliant 10 Award from Popular Science, to name a few.