Shapiro, Irwin I.
http://en.wikipedia.org/wiki/Irwin_ShapiroWikipedia article about the American astrophysicist, one of the pioneers of solar-system tests of general relativity (Shapiro effect, deflection of light by gravity, perihelion precession of various planets).
Submitted in section: Physics: Relativity: People: Shapiro, Irwin I.