There is an exchange of letters between Velikovsky and Einstein posted on the net. Einstein credited Velikovsky with being a good historian and patient researcher, but implied, he was too nice to come right out with it, that V's knowledge of astronomy and physics was not up to scientific standards.
Check out Earth in Upheaval. Carl Sagan may not have liked it, but it's an interesting read.
Which would probably be true since he was an MD. Ran across an interesting passage when taking a quick look re Einstein/Velikovsky; found this from HERE: Nine days after their final meeting Einstein died, and a copy of Worlds in Collision was found open on his desk. He was rereading it because latest discoveries concerning Jupiter had confirmed one of Velikovsky's predictions.
The man apparently had some insights, no?