This chapter is the introduction to the entire monograph devoted to the scholarly work of Giovanni Sartori. In the first part, it emphasises the uniqueness and specificity of Sartori’s work. Biographical passages follow this. Still, further on, the chapter describes the book’s structure, which follows his main professional interests, from philosophy and political philosophy to democratic theory and dictatorship theory, followed by a focus on democratic institutions, especially political parties and democratic regimes, in terms of their functionality. Finally, Sartori’s conception of science and political science is given attention. This introductory chapter also explains why it is important to write about Sartori and, generally, the book’s uniqueness. This is the first book in English to compactly and comprehensively survey Sartori’s entire scholarly output, including little-known topics on which he mainly wrote only in Italian. Existing publications on Sartori are either in Italian or English, but English texts analyse only particular parts of Sartori’s work.