The Strategists: Churchill, Stalin, Roosevelt, Mussolini, and Hitler--How War Made Them and How They Made War - Hardcoverby Phillips Payson O'Brien (Author) Churchill. Hitler. Stalin. Mussolini. Roosevelt. Five of the most impactful leaders of WW2, each with their own individualistic and idiosyncratic approach to warfare. But if we want to understand their military strategy, we must first understand the strategist. In The Strategists, Professor Phillips Payson O'Brien shows how the views these five leaders forged in WW1 are crucial to understanding how they fought WW2.