The Center for Computational Relativity and Gravitation (CCRG) at Rochester Institute of Technology is dedicated to the study of extreme gravitational astrophysics systems through the use of computer simulation and visualization.  Research focuses on some of nature's most spectacular phenomena, such as black-hole and neutron-star collisions that produce intense bursts of gravitational and electromagnetic radiation, collisions between entire galaxies, and the central black-hole engine that powers active galactic nuclei.