"Work smarter, not harder?" I can't find its origin!

Asa, I looked for it in Google, phrasefinder software, and in quotations, and I wasn't able to find it. Coincidentally, I had just used that phrase, referring to the nursing shortage, about 30 minutes before reading this post.

I do think the phrase is right on.

According to this, it was Allan F. Mogensen in the 1930s.

It's repeated on various other sites I found but verbatim which makes me suspect that all are copied from one source.

Thanks, Bob!