Professor Anthony (Tony) George Klein AM, FAA (1935–2021) was an outstanding physicist, university teacher, leader, mentor and science communicator. We recount Tony’s life from his childhood in wartime Romania, his early interest in mathematics, the family’s migration to Australia via Israel in 1953, high school and university education in Melbourne, appointment as a research scientist at the AAEC in Sydney, followed by a distinguished career as an academic, researcher and leader in the School of Physics at the University of Melbourne where he retired as Emeritus Professor. The memoir describes Tony Klein’s personal qualities, the influences and experiences shaping his career, his major research contributions and collaborations in the field of neutron optics and neutron interferometry, his service to scientific and medical organisations and recognition by the university, the Australian Academy of Science and the nation. We evaluate Tony Klein’s contribution to science, knowledge and higher education.

安东尼（托尼）乔治·克莱因教授 AM，FAA（1935-2021）是一位杰出的物理学家、大学教师、领导者、导师和科学传播者。我们讲述了托尼在战时罗马尼亚的童年生活、他早期对数学的兴趣、1953 年全家经以色列移民到澳大利亚、在墨尔本接受高中和大学教育、被任命为悉尼 AAEC 的研究科学家，以及随后的杰出成就。他在墨尔本大学物理学院担任学者、研究员和领导者，并以名誉教授身份退休。该回忆录描述了托尼·克莱因的个人品质、对他职业生涯的影响和经历、他在中子光学和中子干涉测量领域的主要研究贡献和合作、他对科学和医学组织的服务以及大学、澳大利亚科学院的认可和国家。我们评估托尼·克莱因对科学、知识和高等教育的贡献。