measurements. He (his students as well) avoided models based on extensive numerology and numerical analysis, which ultimately did no more than testing the general principles. Sachs characterized his approach as “phenomenological theory,” and over the years with this methodology he and his students worked on groups of problems, each group spanning a period of years but overlapping to some extent either in time or content or both. There have been three such major groups of research activity: (1) electromagnetic interactions of nuclei and their constituents, the nucleons (neutrons and protons); (2) resonances and unstable particles; and (3) time reversal and CP violation.

Although Sachs’s primary interest was teaching and research, when needed and called upon, he offered himself in service to the physics community. He was recognized for his contributions to questions relating to national and international energy policies, for his services to high-energy physics panels, and for his successful efforts in creating the Division of Particles and Fields. He served as associate laboratory director at Argonne National Laboratory (1964-68) and was in charge of its high-energy experimental research program at the new and then the most powerful 12 GeV accelerator, the Zero Gradient Synchrotron (ZGS). He later served as the director of the laboratory (1973-79). He also put in two terms as the director of the Enrico Fermi Institute (1968-73 and 1983-86).

Bob Sachs was born on May 4, 1916, in Hagerstown, Maryland, but his family moved to Baltimore, Maryland, in 1921, when Bob was five years old. Bob’s grandfather came originally from Russia. His family name was Schabershovsky. When he married one of the seven daughters (and no sons) of a man with the family name of Sachs, he was adopted by his wife’s family and acquired the name Sachs. Bob’s father, Harry Maurice Sachs, was the oldest in a family of