https://www.aps.org/archives/publications/apsnews/199904/cdrom.cfm
First, the committee did not include anyone who died before 1900, although it included a few physicists (such as Boltzmann and Roentgen) whose most important contributions, while made before 1900, had a major impact on 20th century physics. Second, it excluded persons still alive at the end of 1997.
楊振寧今年才去世,當然不會在那名單上了。