Dr. Bruce Grossan passed away unexpectedly on February 10, 2026, at the age of 63. Bruce was a scientist at the University of California, Berkeley Space Sciences Laboratory and at Lawrence Berkeley National Laboratory, where he made lasting contributions to high-energy astrophysics and observational instrumentation.
Bruce spent most of his career in Berkeley. He received his bachelor’s degree in physics from the University of California, Berkeley in 1984 and subsequently held a postgraduate position at SSL, where he worked with George Smoot, who later received the Nobel Prize in Physics. Bruce went on to pursue doctoral studies at the Massachusetts Institute of Technology before returning to SSL in 1993 as a postdoctoral researcher. He later held research positions at both LBNL and SSL, contributing to studies of supernovae, gamma-ray bursts, and active galactic nuclei.
Bruce’s research focused on the prompt optical and near-infrared emission from gamma-ray bursts (GRBs), some of the most energetic events in the universe. Bruce was deeply and passionately involved in international collaborations. He led the observation and instrumentation programs at the Energetic Cosmos Laboratory at Nazarbayev University in Kazakhstan, where he and his colleagues developed an automatic-pointing telescope with the rapid response required for GRB observations, along with the Burst Simultaneous Three-channel Instrument (BSTI). These systems operated successfully for several years, enabling new measurements of the earliest optical emission from GRBs. He also worked on the Ultra-Fast Flash Observatory, a pathfinder mission designed to rapidly observe GRB emission from space, based at the Institute for the Early Universe in Seoul, South Korea. He led the development of a multichannel optical camera capable of rapid response to GRB alerts, helping to constrain the properties of prompt optical emission, and participated in observing programs using the Spitzer Space Telescope and the James Webb Space Telescope to study highly energetic astrophysical phenomena.
Bruce brought extraordinary energy and enthusiasm to both his scientific work and his community. He supported and encouraged students and colleagues alike, emphasizing intellectual curiosity, careful analysis, and scientific integrity. He was always willing to offer guidance, discuss new ideas, or continue conversations over a shared meal. Outside the laboratory, Bruce was an avid runner who often astonished younger colleagues with his endurance and pace. He loved the outdoors and enjoyed hiking, rock climbing, and ice climbing. Bruce left a lasting impression on his colleagues and friends through his generosity, his unwavering commitment to science, and his enthusiasm for exploration.