Alex Slepoy of the Computational Research Division’s Complex Systems Group passed away on March 19. He was 50 years old. Slepoy was a computer systems engineer that worked on developing high performance methods in scientific computing. He started work at the Lab in 2011, and was an affiliate from 1997 to 2000. Slepoy worked on several research projects, including a feasibility study for analyzing radiation-sensing data and on the CRD cybersecurity project. Before joining Berkeley Lab, he spent three years managing a modeling and simulation program for the National Nuclear Security Agency, and prior to that developed massively parallel codes in computational biology, chemistry and materials science at Sandia National Laboratories.