Charles Sheffield, a mathematician and physicist, is a past president of both the American Astronautical Society and the Science Fiction Writers of America, and the chief scientist of the Earth Satellite Corporation. He has published over a hundred technical papers and monographs on such subjects as nuclear physics, gravitational field analysis, and general relativity, and an equally large body of popular science articles for the layman. He serves as a science reviewer for several prominent publications. In science fiction, he has received the coveted Nebula and Hugo Awards, as well as the John W. Campbell Memorial Award for his novel for Baen, Brother to Dragons. His other SF novels for Baen include Between the Strokes of Night, The Mind Pool, Convergent Series, and its sequel, Transvergence. Dr. Sheffield's scientific and literary credentials make him the ideal writer to reveal the exciting breakthroughs of modern science to the reader while losing none of the science and none of the excitement.