His biography of Otto von Bismarck has been translated into English, French, Italian, and Japanese.

[2][3] His father was Franz Gall, a Wehrmacht lieutenant general killed in Italy in December 1944.

[2] His 1960 doctoral thesis examined the political thought of Benjamin Constant, a French liberal, and its influence in Vormärz Germany.

This informed an influential 1975 article about the effects of the 1848 revolution upon German liberalism:[4] Gall argued that the revolution transformed liberalism from a constitutional movement committed to a classless society of burghers to an economically bourgeois ideology committed to free-market capitalism.

[5] His biography of Otto von Bismarck has been translated into English, French, Italian, and Japanese.