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
The third novel, "Origin", is set in a multiverse that is a compromise between the ideals in the first two novels: that life is only on Earth, but at the same time is everywhere. This novel solves the Fermi Paradox by suggesting that intelligent life is segregated into separate parallel universes.