Julián Simón López-Villalta is a biologist fascinated by one question: why are there so many species? His wide range of interests, from ecology to evolution and paleobiology, makes him consider possible answers from a broad perspective. He enjoys being in nature, either watching wildlife, doing nature photography, or geologizing; when possible, he takes along his high-school students of biology and geology. Julián lives in Miguelturra (Ciudad Real, Spain) with his wife.