Dr. Sydney A. Barnes is a Research Scientist at SSI, which he joined in 2011. He works in the area of stellar astrophysics, and has a particular interest in understanding, both theoretically and observationally, the rotation and activity of cool stars. Over the past decade, he has developed a method called "gyrochronology" for deriving the age of a cool main sequence field star from its rotation rate and its color or mass. The method has been both feted and reviled, not least because of its etymology and associations. Sydney's long observing runs, including a 39 night run at CTIO, have resulted in traffic "incidents" on multiple continents, all of which are relieved that he is now often working with data from collaborators or space (Chandra, Kepler, etc.).