Never heard of him outside Watchtower either.
Alexander Hislop of “Two Babylons”, and historian Will Durant, are another two names I probably never would have heard outside Watchtower. Not to mention the infamous Johannes Greber.
There’s probably a substantial list of Watchtower “peculiars and favourites” that could be drawn up.
I think it’s because some Watchtower writers tend to look up the Watchtower index whenever they are writing an article (to the extent they still write general topic articles these days) and repeat whatever quotes and references they find in earlier publications.