Pioneered by Karl Deisseroth, the field of optogenetics has yielded unprecedented insight into brain activity and neural circuitry. Stanford researchers have developed a portfolio of the methodology, tools, and techniques necessary for optogenetics research. Ranging from animal models to viral vectors, and lighting sources to stimulation devices, this portfolio of technologies has multifaceted applications in drug discovery, therapeutics, neurostimulation, neurodegenerative diseases, mood disorders, and neuroimaging.