Like no other philosopher of this century, the late Yves R. Simon grappled with philosophical issues that still carry weight today. This collection of his essays explores an impressive range of genuinely foundational topics of philosophical inquiry. These essays discuss, among other topics, the relationship between faith and reason, the nature of sensation, and the various meanings of work. Simon's significant contribution to philosophy through these varied essays is unquestionable, and this is the first such collection of his works. Philosopher at Work will be indispensable for philosophers of all backgrounds.