Velikovsky, if I remember correctly, had doctorates in a couple of the sciences as well as psychoanalysis. I thought his books, Earth in Upheaval, Ages in Chaos, and another..?...were beautifully written, some passages almost poetic.
I think the one you're forgotten is Worlds in Collision. It was his premier book of his Interdisciplinary Synthesis series. It all started as a side discovery when he was researching for the book he didn't get around to publishing until 1960: Oedipus and Aknahton.