  A status report on the jet quenching physics in heavy-ion collisions is given
as it appears after more than 10 years of collecting and analysing data at the
Relativistic Heavy Ion Collider (RHIC) and ~1.5 years of physics at the Large
Hadron Collider (LHC). The (theoretical) predictions and expectations before
the start of the LHC program are contrasted with the most recent experimental
results, focussing on the nuclear modification factor R_{AA}, the elliptic flow
v_2 of high-p_T particles, and on the problem of initial conditions.
