Jack M. Hollander (1923-2011) was an American nuclear physicist known for his pioneering work at the Lawrence Berkeley National Laboratory. His career began with fundamental research in nuclear spectroscopy, but he later distinguished himself by founding and directing the laboratory's Energy and Environment Division, shifting his focus to energy and environmental policy. He authored the book *The Real Environmental Crisis* (2003), in which he argued that technological progress and economic growth were essential tools for solving environmental problems, challenging the more pessimistic views of his time. For his scientific contributions, he received numerous awards, including the prestigious Ernest Orlando Lawrence Award and a Guggenheim Fellowship. He was also a Fellow of the American Physical Society and the American Association for the Advancement of Science, consolidating his reputation as an influential voice in the scientific debate on energy.