It is with great sadness that we announce that Dr. Hirotsugu (Hiro) Tsuruta, a senior scientist and biophysicist in the Structural Molecular Biology program at Stanford Synchrotron Radiation Lightsource (SSRL) at SLAC, passed away on August 25, 2011, in Japan, after a courageous fight with cancer.  Funeral services took place in Sasebo, Japan, on August 27.
 
 Hiro worked at SSRL for more than 20 years, and with great dedication and scientific insight provided leadership for the build-up of the SSRL biological small angle x-ray scattering research program, and a bioSAXS beam line facility that today serves a large user community.  He also served the international community in many ways.  His contributions were numerous, and he leaves an international legacy in this growing area of science, for which he pursued new developments until the end.
 
 SSRL will organize an event to honor his contributions, and information will follow when plans become available.
 
 Britt Hedman and Keith Hodgson