Sadly, Paul Martin died last month. A reader sent along a remembrance from the University of Arizona. Martin is best known as an advocate for the "overkill" hypothesis for the extinction of Pleistocene megafauna. I had not heard at the time, and I'm sure many others missed the news also.
A very accessible account of some of Martin's work is featured in Connie Barlow's book, The Ghosts of Evolution: Nonsensical Fruit, Missing Partners, and Other Ecological Anachronisms. I recommend this book often to students.