"Murray Leinster was not only a very good writer, he was a pioneer. He invented the field of parallel-universe stories with his "Sidewise in Time," and his "First Contact" set the pattern for all the stories that followed of—well—of first contact with alien civilizations. The wondrous thing about his work is that those great, trend-setting stories read as fresh and timely today as they did all those years ago." —Frederik Pohl