High Financier: The Lives and Time of Siegmund Warburg book by Niall Ferguson

In this pathbreaking new biography, based on more than ten thousand hitherto unavailable letters and diary entries, bestselling author Niall Ferguson returns to his roots as a financial historian to tell the story of Siegmund Warburg, an extraordinary man whose austere philosophy of finance offers much insight today.

A refugee from Hitler's Germany, Warburg rose to become the dominant figure in postwar City of London and one of the architects of European financial integration. Seared by the nearcollapse and then "Aryanization" of his family's long-established bank in the 1930s and then frustrated by the stagnation of its Wall Street sister, Kuhn Loeb, in the 1950s, Warburg resolved that his own firm of S. G. Warburg (founded in 1946) would be different.