Why did Martin Krygier become a rule of law guy? This Introduction to a Special Issue of the 'Hague Journal on the Rule of Law', which consists of 33 short essays celebrating Krygier as a colleague, mentor and friend, discusses some of the factors which prompted him to develop a distinct and influential body of work on the rule of law over the past three decades: the rule of law revival, especially in Central and Eastern Europe; his involvement with Philip Selznick; and his dialogue with other prominent theorists, including Gianluigi Palombella and Jeremy Waldron. The Introduction gives a sense of the importance of Krygier's personal background and history, and it also discusses some of the key features of his theory, and how these have developed over the past decades.