Peter Hacker is one of the most notable interpreters of Wittgenstein's work, a powerful and sophisticated exponent of Wittgensteinian ideas, and a distinguished historian of the analytic tradition. Thirteen leading philosophers and Wittgenstein scholars offer specially written essays in honour of Hacker. Their contributions deal with a variety of themes associated with Wittgenstein. Some deal with issues of Wittgenstein scholarship and interpretation, including areas that have attracted an increasing amount of attention, such as ethics and religion. Others deal with central topics from the history of analytic philosophy. Finally there are essays that explore and assess Wittgensteinian ideas, in some cases as developed by Hacker, in the philosophy of language and the philosophy of mind, or in related areas such as the philosophy of action and the philosophy of neuroscience.