Help: Jewish characters in Robert Heinlein books

Hi! I know this probably should be in r/Heinlein but frankly I don’t trust a non-Jewish sub with any Jewish questions.

I read every book by Robert Heinlein more than twenty years ago and I’ve been trying to remember a specific Jewish character, but internet search is useless these days, and I just found that one Jewish character, who is prominent in one of the books – Rabbi Ezra ben David / Ezra Davidson — has google straight up refusing to admit his exists, as does the Heinlein Concordance.

However, having reviewed the book The Cat Who Walks Through Walls, I’m thinking R’ Ezra might not be the Jewish character I’m trying to remember. This Jewish character was someone who time traveled to the future, so does anyone know if there were any others, or if it was, in fact, R’ Ezra who I was thinking of?

Any help would be greatly appreciated!