This work explores the academic and professional pedagogical activity of John Amos Comenius (1592-1670), widely regarded as the founder of modern pedagogy.The principal sources for this study are relevant biographical studies, as well as Comenius's own works. In terms of methodology, use was made of content analysis, the biographical method, and synthesis.The study's findings revealed J.A. Comenius to be a fundamental figure in the history of pedagogy. He pioneered the class-lesson system, which was revolutionary for his time and which is used to this day in most schools across the world.Furthermore, Comenius was a proponent of a humanistic approach to education -something barely sought after in his time. This aspect has been pointed out by most of his biographers.His didactic ideas are founded on principles of equality, democracy, and universality -these began to be implemented in education much later than his time, but today are honored in schools all over the world.