Dr. Soulé is now professor emeritus ("retired" but working) at UC-Santa Cruz. I am ashamed to say I haven't seen his other books, which should be required for someone that calls himself a conservation biologist - I'm more apt to read a stats book these days but balance is needed. I consider Michael Soule to be a conservation hero because he laid the foundation of evidence-based conservation biology.
I selected Dr. Soule this morning when I came across a reference to him in the New Yorker. Dr. Soule wrote a piece in a 1985 issue of BioScience called "What is Conservation Biology" and two very influential biologist recently wrote an update to that definition that stresses human well-being. As the New Yorker points out, this new definition is at odds with Dr. Soule sentiment. I think reading both will make for an interesting exercise in the conservation biology class (I'll need to read both!).
Go to Conservation Biology Hero #1 Aldo Leopold
Go to Conservation Biology Hero #3 Jane Lubchenco