Successors at the Institute of General Semantics continued for many years along the founders' path. Stuart Mayper (1916–1997), who studied under Karl Popper, introduced Popper's principle of falsifiability into the seminar-workshops he led at the Institute starting in 1977. More modest pronouncements gradually replaced Korzybski's claims that general semantics can change human nature and introduce an era of universal human agreement. In 2000, Robert Pula (1928–2004), whose roles at the Institute over three decades included Institute director, editor-in-chief of the Institute's "General Semantics Bulletin", and leader of the seminar-workshops, characterized Korzybski's legacy as a "contribution toward the improvement of human evaluating, to the amelioration of human woe..."