Nitpick: Onsager died in 1976 [1]. Also, his Nobel citation credits his work on reciprocity relations [2] and, I suppose, by extension regression hypothesis and what we would now call fluctuation-dissipation theorem. His solution of the 2d Ising model was not mentioned (though to be sure a tour de force).

[1] https://en.wikipedia.org/wiki/Lars_Onsager

[2] http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1...