 He was the first to develop a form of double-frequency spectroscopy, Electron nuclear double resonance (ENDOR), for which he chose a name reminiscent of the biblical witch of Endor.This was the forerunner of many other double-resonance methods.In 2006/07, he was awarded the Wolf Prize in Chemistry along with Ada Yonath of Weizmann Institute of Science in Rehovot, Israel for "ingenious structural discoveries of the ribosomal machinery of peptide-bond formation and the light-driven primary processes in photosynthesis".