Found here:
Luc Ferry, A Brief History of Thought | "If you only read one, read this one."
Steven Smith, The Disenchantment of Secular Discourse
Jonathan Haidt, The Righteous Mind
Andrew Delbanco, The Real American Dream: A Meditation on Hope
John Gray, Straw Dogs: Thoughts on Humans and Other Animals
Lesslie Newbigin, The Gospel in a Pluralist Society (approximately the first 65 pages)
Nicholas Wolterstorff, Justice: Rights and Wrongs (pp. 324-362) | "Probably the most difficult reading."
Michael Sandel, Justice: What's the Right Thing to Do?
Miroslav Volf, Exclusion & Embrace: A Theological Exploration of Identity, Otherness, and Reconciliation
Me: I have no particular comment on this list since the only book I've read is Lesslie Newbigin's The Gospel in a Pluralist Society. But that book, along with several others he wrote, has played an important role in shaping the contours of my mind. Because of Newbigin's experience living and serving in India, when he returned to the UK later in life, he brought a rich worldview perspective that challenged and nourished the Western Christian mind in important ways.
As for the first book on Keller's list, A Brief History of Thought, about which he wrote "If you only read one, read this one,"Justin Taylor quotes him further:
This book right now is a terrific, fast way to get a handle on western culture because:
It’s a great survey of western thought—very few are available, especially from a non-Christian who is sympathetic to Christianity. All other books you buy will be less comprehensive. Though his expression of Christian doctrine is often garbled, Ferry has deep appreciation for Christianity, and when he describes how Christianity swept Greco-Roman paganism away as a cultural force, it is a remarkable, eye-opening account. It shows a) how complex and difficult it is to change culture, but b) how indeed culture does get changed. The shifts away from Christianity are also extremely interesting.