  In the last 30 years, the physics of jet quenching has gone from an early
stage of a pure theoretical idea to initial theoretical calculations,
experimental verification and now a powerful diagnostic tool for studying
properties of the quark-gluon plasma (QGP) in high-energy heavy-ion collisions.
I will describe my collaboration with Miklos Gyulassy in this exciting area of
high-energy nuclear physics in the past 30 years on this special occasion of
his 70th birthday and discuss what is ahead of us in jet tomographic study of
QGP in heavy-ion collisions.
