Robert H. Gray
In 2016, Gray published an article in "Scientific American" about the Fermi paradox, which claims that if extraterrestrials existed, we would see signs of them on Earth, because they would certainly colonize the galaxy by interstellar travel. Gray argues that the Fermi paradox, named after Nobel Prize-winning physicist Enrico Fermi, does not accurately represent Fermi's views. Gray states that Fermi questioned the feasibility of interstellar travel, but did not say definitively whether or not he thought extraterrestrials exist.
Manifold Trilogy
Each one of the main novels deals with a possible resolution to the Fermi paradox. The first, "Time", is set in a universe that is completely devoid of intelligent life beyond that of mankind and its creations (i.e. A.I. and uplifted animals).