This is fair. I was thinking of Bohr's work on establishing a proper school of QM. This is also why I didn't list Einstein et al.; he rejected that school and i

This is fair. I was thinking of Bohr's work on establishing a proper school of QM. This is also why I didn't list Einstein et al.; he rejected that school and its work. It's true that many pre-QM concepts were laid down between 1890 and 1930, but the concepts that we embrace today are usually associated with the Copenhagen interpretation, which comes from Bohr's work in the 30s at his school. To be blunt and opinionated, I see the 1890s as asking the questions which we would answer in the 1930s. We found that set theory has gaping holes, and the answer turned out to be that all maths has gaping holes. We found that classical mechanics can't describe ovens, and it turns out that we need QM for describing lots of low-level physical phenomena.