Edward S. Boyden is an American neuroscientist at MIT. He is the Y. Eva Tan Professor in Neurotechnology, a faculty member in the MIT Media Lab and an associate member of the McGovern Institute for Brain Research. In 2018 he was named a Howard Hughes Medical Institute Investigator. He is recognized for his work on optogenetics. In this technology, a light-sensitive ion channel such as channelrhodopsin-2 is genetically expressed in neurons, allowing neuronal activity to be controlled by light. There were early efforts to achieve targeted optical control dating back to 2002 that did not involve a directly light-activated ion channel, but it was the method based on directly light-activated channels from microbes, such as channelrhodopsin, emerging in 2005 that turned out to be broadly useful.