János S. Petőfi (1931-2013) was one of the founders of Text Linguistics in Germany in the early ‘70s. He developed different text models, the most famous of which were the Text Structure World Structure Theory (TeSWeST) and Semiotic Textology. In this volume, some of his colleagues and disciples discuss his theoretical contributions to prove the enormous impact of his thoughts in the fields of linguistics, literary theory, rhetoric and semiotics. The essays here consider the notion of coherence, which Petőfi deemed to be the only sufficient condition for textuality, the relationships between his textual models and disciplines such as cognitive, computational and corpus linguistics, and his contributions to the analysis of literary and multimedial texts.