This is a time of great opportunity in nuclear spectros-copy. The development of radioactive beam capabili-ties around the world is opening a new landscape for discovery, and the connections between nuclear structure studies and astrophysics, neutrino physics, and physics beyond the standard model are stronger than ever. New detector technologies are evolving which can meet the challenges of the new generation of experiments. Leading these is the technology of gamma-ray tracking which can revolutionize gamma-ray spectroscopy in a way that large arrays of gamma detectors did a decade ago. During the last few years this technology has been shown feasible and GRETINA a 1 detector is under construction. However, the momentum in developing this technology to its full potential must continue to-wards GRETA, a full pi calorimeter. GRETA will carry gamma-ray spectroscopy into the next generation where it will be needed to fully exploit the science opportunities at radioactive beam facilities and increase the reach of stable beam facilities. In addition, gamma-ray tracking technology will have important applications for science, medicine, and homeland security.
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