books.google.com - Two novels deal with time travel and a dangerous new invention, and are accompanied by stories about space warfare, time viewing, and extraterrestrials...https://books.google.com/books/about/Other_Worlds_of_Isaac_Asimov.html?id=3x4hAAAACAAJ&utm_source=gb-gplus-shareOther Worlds of Isaac Asimov
Martin H. Greenberg was born in 1942. He received a doctorate in Political Science in 1969 and was a professor of political science at the University of Wisconsin until 1995. Over the course of his long and prolific career, Greenberg has published around 1000 anthologies and has worked with numerous best-selling authors including Isaac Asimov, Tom Clancy, Stephen King, Anne McCaffrey, Sue Grafton, Scott Turow and Dean Koontz. He has won numerous awards including the Horror Guild Award in 1994, the Deathrealm Award in 1996, the Bram Stoker Award in 1998, and the Prometheus Special Award in 2005. He also received The Ellery Queen Award for lifetime achievement in mystery editing and the Milford Award for lifetime achievement in science fiction editing.