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About

John Brophy is a pioneering aerospace engineer whose career has centered on the audacious challenge of near-Earth asteroid (NEA) retrieval, redirection, and utilization. He is perhaps best known as a driving force behind the Keck Institute for Space Studies (KISS) feasibility investigations — published in multiple landmark papers beginning in 2011–2012 — that rigorously examined whether humanity could robotically capture and return an entire asteroid to Earth's vicinity. These foundational studies, collectively accumulating nearly 200 citations, laid the intellectual groundwork for NASA's Asteroid Redirect Mission (ARM) and its successor, the Asteroid Redirect Robotic Mission (ARRM). Brophy's work spans the full arc of asteroid mission design: from assessing the technological readiness for capture and retrieval, to evaluating deflection strategies such as kinetic impactors, gravity tractors, ion beam deflection, and laser ablation for planetary defense. His research has also highlighted the strategic synergies between robotic asteroid missions and long-term human deep-space exploration, including eventual crewed missions to Mars. Brophy's body of work has fundamentally shaped how NASA and the broader space community think about asteroid science, planetary defense, and in-space resource utilization.