  Soon after the postulation of quarks, it was suggested that they interact via
gluons, but direct experimental evidence was lacking for over a decade. In
1976, Mary Gaillard, Graham Ross and the author suggested searching for the
gluon via 3-jet events due to gluon bremsstrahlung in $e^+ e^-$ collisions.
Following our suggestion, the gluon was discovered at DESY in 1979 by TASSO and
the other experiments at the PETRA collider.
