The "Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun" (also known as "Cool Stars") has been running for 34 years since the first one was held in Cambridge, Massachusetts, in 1980. Cool Stars is now a well established workshop, which gathers biennially about 400 worldwide experts in Low-Mass Stars, Solar Physics and Exoplanets, creating an stimulating cross-disciplinary exchange environment in these fields. Cool Star meetings have a long tradition of presenting cutting-edge science, as shown by outstanding results such as the discovery of the first Extrasolar Planet and the first confirmed Brown Dwarf, which were both first announced in the Cool Stars 9 meeting celebrated in Florence, Italy in 1995.