World War I and The Interwar Period
A politically active socialist, he nevertheless supported the Allied cause in World War I. After the war, he taught sociology for a time at the University of Washington, then moved to Weimar, Germany where he wrote and studied on the development of modern socialism and society.
Returning to Belgium, he became Vice President of the Belgian Labour Party (POB/BWP). Upon the death of Emile Vandervelde in 1938, he assumed its presidency.
His views on socialism and his revision of Marxism were controversial. His promotion of the idea of "planisme", or planning, was widely influential in the early 1930s, in particular among the Non-Conformist Movement in France.
Read more about this topic: Henri De Man
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