Alvaro is a Hugo and Locus finalist with some fifty stories published in professional magazines, such as Analog, Lightspeed, Beneath Ceaseless Skies, Galaxy's Edge, and Nature, and numerous anthologies, like The Year's Best Science Fiction & Fantasy, Cyber World, This Way to the End Times, The Mammoth Book of Jack the Ripper Stories, The Mammoth Book of the Adventures of Professor Moriarty, The Unquiet Dreamer, It Came from the Multiplex, Nox Pareidolia, and Seasons Between Us. He has also published over a hundred and fifty essays, reviews and interviews in venues like The Los Angeles Review of Books, Locus, Tor.com, Asimov's, Strange Horizons, Clarkesworld, The New York Review of Science Fiction, Foundation: The International Review of Science Fiction, Intergalactic Medicine Show, and others. He has a degree in Theoretical Physics from the Universidad Autónoma Madrid.