Hmm, good question as I admire so many of them. My favourite scientist, because he’s the one who got me into science is more of a science writer now, Prof. Bill McGuire of University College London. He is a world renowned expert on natural disasters, and I remember being lucky enough to do a Masters degree in London where he was a lecturer. It was quite something to be lectured by my childhood hero and have him give me top of the class for one of our assignments. He may be a bit of a doomsday fantasiser, but he’s the main reason I got into science, so he’s my pick!