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In 1966 Hector Rubinstein came to the Weizmann Institute and worked on the quark model. Then nearly all particle physicists believed that nucleons and p ions were elementary, like electrons and photons and that quarks were nonsense. Hector believed that quarks were real, even though we did not know what they were. He then used the quark structure f or hadrons to make predictions testable by experiment. He first joined Lipkin and Scheck on q uark model predictions. He then directed a student Hannah Stern, later Stern-Kluborg to inv estigate proton-antiproton annihilation using a revolutionary and controversial model in which the initial three quarks and three antiquarks rearranged to create three mesons. This was the o nly m del that fit the experimental data and showed conclusively for the first time that a nucleon was made of three quarks. But the particle physics establishment rejected this work because they knew that quarks were nonsense. Hector continued with further work on the quark model and the n turned to other areas. Now Hector has left us much too soon, but his quark model predictions still influence new experimental analyses

Contributions and Heritage of Hector Rubinstein History of the Constituent Quark Model New Challenges for QCD