Don Mitchell‘s essay “Neil Smith, 1954-2012: Radical Geography, Marxist Geographer, Revolutionary Geographer” is available on his website. The whole thing is well worth reading, even if you know the work well. It’s a thoughtful and moving piece. What is especially interesting, though, is the concluding discussions of the unfinished work on revolution, including a collaborative book with his students “from his Revolution seminar, Revolting New York, which would lay out the historical geography of revolt, rebellion, riot, and revolution in New York City. This was unfinished when Neil died; his students are currently working to finish it off and get it into print” (p. 43 n. 17).