Robert Ralph Phelps, an American mathematician who was known for his outstanding contributions to analysis, particularly to functional analysis and measure theory, passed away on January 4. He had been a professor of mathematics at the University of Washington since 1962. The best known result of Bob Phelps is probably the celebrated Bishop-Phelps theorem obtained in collaboration with Errett Bishop.
Information: http://en.wikipedia.org/wiki/Robert_Phelps
http://experimentalmath.info/blog/2013/02/in-memoriam-robert-r-phelps/