Karl Alexander Deisseroth (born November 18, 1971) is an American scientist. He is the D.H. Chen Professor of Bioengineering and of psychiatry and behavioral sciences at Stanford University. He is known for creating and developing the technologies of hydrogel-tissue chemistry (e.g., CLARITY, STARmap) and optogenetics, and for applying integrated optical and genetic strategies to study normal neural circuit function, as well as dysfunction in neurological and psychiatric disease. In 2019, Deisseroth was elected as a member of the US National Academy of Engineering for molecular and optical tools for his discovery and control of neuronal signals behind animal behavior in health and disease. He is also a member of the US National Academy of Sciences and the US National Academy of Medicine. Source: Wikipedia (en)