The most successful theory in the physics may be QFT, it is the application of QM. Most physicists(mainstream) believe that QM has been established in about 1927, but Einstein felt not so satisfactory with it and challenged Bohr times again, the celebrating fruit was EPR paper in 1935. After that, Bohm published his two “hidden variable” papers in 1952, and J.S.Bell published his “Bell inequalities” in 1964 ,which is a great paper. Since 90s QI or QC’s increase show Bell’s deep insight, there is someone who asserts Bell is the greatest man in the 20th century. For example ,see here:

Quantum theory is the most successful scientific theory of all time. Many of the great names of physics are associated with quantum theory. Heisenberg and SchrÃ¶dinger established the mathematical form of the theory, while Einstein and Bohr analysed many of its important features. However, it was John Bell who investigated quantum theory in the greatest depth and established what the theory can tell us about the fundamental nature of the physical world.

This is a big advance in foundation of QM, but it seams not product some fruits in QFT. Most physicist think QFT has established in 70’s, although there so many physicists to seek TOE, QG, SUSY, and few think the relation of QFT and the foundation of QM.

It is safe to say that no one understands quantum mechanics. R.P.Feynman *the character of physical law (1967,p129)*

Honest Feynman! But Feynman seamed be happy at QED, because its precision to data of experiments, he is attributed to the phrase “shut-up-and-calculation”. He is no unsatisfactoriness with QM like Einstein,even Bohr,in spite of ugly renormalization. Today,those masters like Steven Weinberg,Edward Witten ,etas, do not talk more about the foundation of QM, and maybe there are no any problems in the foundation of QM,as Fuchs and Peres said,”we would be the last to claim that the foundations of quantum theory are not worth further scrutiny.”(Fuchs2000a) which is about “Interpretation of QM”, but “Entanglement” is so important in QM and do not appear in standard text of QM, and do it product big effects in QFT ?

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