I first encountered the work of Harold Lasswell in the late 1950s, when I was a barely awake undergraduate at a university whose reputation for mediocrity was richly deserved. I opened Politics: Who Gets What, When, How to the first paragraph: ‘The study of politics is the study of influence and the influential. The science of politics states conditions; the philosophy of politics justifies preferences. This book, restricted to political analysis, declares no preferences. It states conditions.’ I had never heard of Lasswell, for my political science courses limited themselves to subjects like Congressional seniority and Cabinet responsibility in Britain. One course discussed the law of piracy, a subject I had trouble linking to international politics in the 1950s. Some enterprising instructors occasionally discussed the balance of power, and one even assigned David Truman. But Lasswell was terra incognita to me, as he no doubt was to most undergraduates in those years.