I was fortunate to have the opportunity to listen to Nielsen talk in person about a few of the conservationists in his book earlier this year. His passion and the dedication that he put into each biography was very evident. It took a hot minute to actually get around to reading the book, but I can definitely say it was the best collection of biographies I've ever read. This generally isn't my genre of choice, but it was wonderful to read such in-depth, well-presented biographies of a diverse range of conservationists.