The book was Worlds in Collision, written in about 1950 or so. A very interesting read, well researched and tying historical events to the possible cause of a close pass of the near earth-sized comet which was captured into an orbit and is now known as Venus.
Many of his theories were proven correct when the space program enabled exploration.
Thank you much! I’m off to read more about him. I have a copy of the book waiting for me at the library.