 Around the same time, Feyerabend met David Bohm, who was lecturing in physics at the University of Bristol. Bohm had been the favoured protegé of Niels Bohr, and his first book, Quantum Theory (Englewood Cliffs, NJ: Prentice-Hall, 1951), was a lengthy defence of the Copenhagen Interpretation of the quantum theory. But in the early 1950s Bohm rejected his former view, and became one of the leading defenders of the then-unpopular “hidden-variables” theory. He was to be a significant influence on Feyerabend, weaning him away from Popper with his somewhat Hegelian account of the structure of reality. Feyerabend produced a critical study of Bohm’s 1957 book Causality and Chance in Modern Physics in 1960, when he was still very much under Popper’s influence. In their later work, though, Bohm and Feyerabend moved in parallel directions, towards an interest in “fringe” science. And Bohm’s ideas sunk in gradually, having visible effects on Feyerabend’s published productions from the mid–1960s onwards (see Van Strien 2020). Feyerabend increasingly flirted with the vaguely Hegelian metaphysic that he had discerned and critiqued in Bohm’s book.