Karl Alexander Deisseroth is an American scientist. He is the D.H. Chen Professor of Bioengineering and of psychiatry and behavioral sciences at Stanford University.Karl Deisseroth has worked on developing and applying high-resolution tools for controlling (optogenetics.org) and mapping (clarityresourcecenter.org) specific well-defined elements within intact and fully-assembled biological systems. We continue to develop and apply these and other tools (integrated with optical, electrophysiological, computational, molecular, and behavioral approaches) for the study of neural physiology and behavior in freely-moving mammals. We are interested both in natural behaviorally-relevant neural circuit dynamics, and in pathological dynamics underlying neuropsychiatric disease symptomatology and treatment.