Our Zombies, Ourselves: Colson Whitehead's "Zone One"
https://lareviewofbooks.org/article/our-zombies-ourselves-colson-whiteheads-zone-one/
This is a poignant and thoughtful review of Zone One in the LA Review of Books, specifically analyzing the role of NYC, zombie culture in the 2010s, and the parallel hollowness of both sweepers like Mark and stragglers.
Zone One: Six Questions for Colson Whitehead
https://harpers.org/2011/10/six-questions-for-colson-whitehead/
This Harper's interview with Whitehead reveals some interesting tidbits about the author's motivations for writing the book and its social/cultural context.