Roger Y. Tsien (1952-2016).

Roger Y. Tsien, professor at the University of California, San Diego and Howard Hughes Medical Institute Investigator, passed away on August 24, 2016. Tsien shared the 2008 Nobel Prize in Chemistry for his work on the discovery and development of the green fluorescent protein, and developed a whole series of colored fluorescent proteins, as well as widely used small-molecule probes for Ca(2+) ions.