Doug Cook has spent over two thousand hours underwater exploring and photographing life in the oceans. He is retired from a thirty-four year career as a petroleum geophysicist. This career allowed him to explore five of the world’s continents and live in Saudi Arabia for eighteen years. A career highlight in petroleum exploration was participating in ten years of deep-water submersible oil seep studies in the Gulf of Mexico. These seeps have associated chemosynthetic communities of life. As extremophiles, these organisms relate to Doug’s interest in astrogeology and exobiology. Doug has always had a passion for astronomy and space exploration. He now pursues this passion as an author. The beauty of the mountains and geology lured Doug to retire in Colorado. He has two daughters and lives in Colorado Springs with his wife Elizabeth.