This text is an excerpt from Paul Strathern's Wittgenstein in 90 Minutes, a biography exploring the life and philosophical work of Ludwig Wittgenstein. Strathern details Wittgenstein's unconventional upbringing, his transition from engineering to philosophy, and his development of two distinct philosophical systems. The book summarises Wittgenstein's key arguments from his Tractatus Logico-Philosophicus and Philosophical Investigations, highlighting his unique approach to logic and language. Finally, the text provides a chronology of important dates in philosophy, situating Wittgenstein's contributions within a broader historical context.