  In the first talk I discuss the usefulness of jet grooming for testing jet
quenching mechanisms, and I present a calculation of soft-drop jet mass
distribution in proton-proton and heavy ion collisions. In the second talk I
discuss the comprehensive studies of quark and gluon jet substructure as a way
to search for qualitatively new jet modification signatures. I emphasize the
importance of precise understanding of jet substructure as well as powerful
analysis tools in future heavy ion jet physics studies, with direct
applications to hard probes using heavy flavors and hadronically-decaying
electroweak bosons.
