In 1989, Joachim Schulte first presented this introduction to the person and work of Wittgenstein, the most influential philosopher of the 20th century. Even today, the selection and weighting of the topics, according to the author, are "undoubtedly justifiable"; at no point does "what has been said fail to do justice to the current state of research." Nevertheless, he has thoroughly reviewed the volume and summarized the changes in research since then in an afterword: What are the actual works of Wittgenstein? Is there an early and a late Wittgenstein? How interesting is the estate? An "established introduction" brought up to date.