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The life of Ernst Ising and the steps to solving the model named after himare reported in parallel. Wilhelm Lenz suggested his student Ernst Ising toexplain the existence of ferromagnetism on the basis of his publication in1920. The result, published in 1925 was disappointing, because only the onedimensional case could be solved with a negative result about the absence offerromagnetism. Wolfgang Pauli who was an assistant of Lenz in Hamburgpublished in the same year his 'nonclassical ambiguity', later identified asthe spin of the electron, and the exclusion principle. He was the first - atthe Solvay Conference in 1930 - to present the Hamiltonian of the Ising modelas we know it today.  Meanwhile Ising had left university research and due to the politicalsituation in 1938 had to leave Germany and fled to Luxemburg. This went in handwith damaging the network of researchers dealing with the problem offerromagnetism and more generally with phase transitions and statisticalphysics. In 1944, the year when Luxemburg was liberated by the American troopsand Ising and his family was rescued, Lars Onsager presented a solution of thetwo-dimensional case. In 1952 Chen-Ning Yang solved the problem of Ising'sthesis in two dimensions; one year later Ising became the US citizenship. Thefollowing development showed, that the model turned out to be a highway tomodern physics concepts applicable also in other fields, although the finalexact solution in three dimensions has not yet been reached.

The Survival of Ernst Ising and the Struggle to Solve His Model