According to reviewer Brian Regal, “Defining Darwin is another in a long line of works geared towards general audiences to help them understand the various complex issues involved in evolutionary studies and history. Rather than a single book-length work, this is a collection of essays, some of which have been published elsewhere and all of which have been updated here.” He concludes, “Michael Ruse has spent a career producing works on evolution for public consumption that are both informative and thought-provoking. Defining Darwin is another in this line. If you know someone — even an antievolutionist — who needs to know more about this subject, get them a copy.”