  A revolution in elementary particle physics occurred during the period from
the ICHEP1968 to the ICHEP1982 with the advent of the parton model from
discoveries in Deeply Inelastic electron-proton Scattering at SLAC, neutrino
experiments, hard-scattering observed in p$+$p collisions at the CERN ISR, the
development of QCD, the discovery of the J/$\Psi$ at BNL and SLAC and the clear
observation of high transverse momentum jets at the CERN SPS $\bar{p}+p$
collider. These and other discoveries in this period led to the acceptance of
QCD as the theory of the strong interactions. The desire to understand nuclear
physics at high density such as in neutron stars led to the application of QCD
to this problem and to the prediction of a Quark-Gluon Plasma (QGP) in nuclei
at high energy density and temperatures. This eventually led to the
construction of the Relativistic Heavy Ion Collider (RHIC) at BNL to observe
superdense nuclear matter in the laboratory. This article discusses how
experimental methods and results which confirmed QCD at the first hadron
collider, the CERN ISR, played an important role in experiments at the first
heavy ion collider, RHIC, leading to the discovery of the QGP as a perfect
liquid as well as discoveries at RHIC and the LHC which continue to the present
day.
