Well, BBC listeners chose, surprisingly, Karl Marx by an overwhelming majority. The next three in the runnings also exercised great influence for what most would call evil: David Hume, Ludwig Wittgenstein, and Frederich Nietzche. Finally, Plato gets in there, but his 6% pales in comparison to the 28% garnered for Marx.
I'm interested in what Mere-O readers think of this poll and its results (Is Marx even a proper philosopher?). Also, who would you name as the greatest philosopher and why? Take a look at the BBC shortlist to give yourself an idea of the criteria for a "philosopher" - you know it is broad when the likes of Kierkegaard and Marx are on there.
Matthew Lee Anderson is the Founder and Lead Writer of Mere Orthodoxy. He is the author of Earthen Vessels: Why Our Bodies Matter to our Faith and The End of Our Exploring: A Book about Questioning and the Confidence of Faith. Follow him on Twitter or on Facebook.