Deisseroth is a psychiatrist and researcher who pioneered the field of optogenetics, the study of the relationship between light and the workings of the brain. In this fascinating book, Deisseroth explores the connections between our brain's circuitry and everyday emotions. He profiles a number of his own patients, including a woman with disordered eating and a man who fell into deep depression following the death of his wife. Both illuminating and beautifully written, this book will change the way you consider human emotions.