The contributions in this volume provide a snapshot of the latest research and future plans for space-borne and ground-based experiments dedicated to the observation of the gamma-ray sky. The articles are authored by both seasoned veterans of the first dedicated gamma-ray missions, and young scientists entering the fascinating field of gamma-ray astrophysics.With the advent of gamma-ray instrumentation on spacecraft and large and sensitive ground-based detectors, new and unexpected phenomena have been discovered, such as gamma-ray bursts and gamma-ray emission from blazars. The immense vitality of the field in the current ?post-EGRET era? is witnessed by the numerous ongoing and forthcoming gamma-ray experiments documented here, complementary to various cosmic-ray, neutrino, astroparticle and X-ray projects.

This book collects contributions presented in the seventh edition in a series of Workshop on High Energy Gamma-ray Experiments. The focus of the Workshop was on Gamma-ray Physics in the LHC Era. In order to understand the origin of the Universe reaserchers are nowadays using two powerful and complementary approaches. On one side radiation produced many years ago and now arriving to us from space, is studied with different experimental techniques. On the other one, particle accelerators can recreate in laboratory the high density high energy state present at the beginning of the Universe. Results are here presented from experiments in space, on earth and underground, regarding cosmic radiation.