GRETINA and GRETA

The gamma-ray energy tracking array GRETINA has been successfully operating since 2012, with science campaigns at both Michigan State University’s National Superconducting Cyclotron Laboratory and at Argonne National Laboratory’s ATLAS/CARIBU Facility. I will review selected science highlights from these campaigns and discuss the ongoing project to construct the full 4-pi GRETA array, which will be a key instrument for rare isotope experiments at the future FRIB (Facility for Rare Isotope Beams) under construction at Michigan State University.