Caltech has recognized five of its graduates with the Distinguished Alumni Award, the highest honor regularly bestowed by the Institute. The award acknowledges a particular achievement, a series of achievements, or a career of achievements of noteworthy value. Since its inception in 1966, the award has been granted to outstanding alumni in the sciences, engineering, business, and the arts. The 2011 recipients are Leroy E. Hood, Steven E. Koonin, Cleve B. Moler, Carolyn C. Porco, and Albert Y. C. Yu.