Joseph Rotblat was a distinguished physicist, born in 1908 in Warsaw, Poland, who later became a British citizen. He is well-known for his work on nuclear physics, particularly during the Manhattan Project. However, he chose to leave the project upon realizing its implications for warfare and the potential for destruction. Rotblat's commitment to peace and humanitarian efforts led him to dedicate his life to promoting nuclear disarmament and the ethical use of science. Throughout his career, Rotblat was an advocate for scientists’ responsibility in preventing the misuse of their research. He founded the Pugwash Conferences on Science and World Affairs, which brought together scientists from around the world to discuss global issues related to nuclear weapons and security. His efforts earned him the Nobel Peace Prize in 1995, a testament to his lifelong dedication to peace. Beyond his scientific achievements, Rotblat was also a compelling speaker and writer, articulating the moral dilemmas faced by scientists. He believed in the need for a collective effort to address global challenges, emphasizing the importance of dialogue and cooperation among nations. His legacy continues to inspire advocates for peace and responsible science today. Joseph Rotblat was a notable physicist and peace activist, born in 1908 in Poland and later a British citizen. He gained fame for his work in nuclear physics during the Manhattan Project but left due to ethical concerns over the use of nuclear weapons. His commitment to peace spurred him to promote nuclear disarmament and the ethical application of science. Rotblat founded the Pugwash Conferences to foster discussions among scientists about global security and the risks of nuclear weapons. His lifelong dedication to peace earned him the Nobel Peace Prize in 1995, highlighting his significant contributions to promoting disarmament and international understanding. As a speaker and writer, Rotblat addressed moral dilemmas faced in scientific pursuits, advocating for a united approach to global challenges. His legacy remains a source of inspiration for those who work towards peace and the responsible use of scientific advancements today.