Are you in tech? Then an obvious example is Simon Peyton Jones. Full professor, Fellow of the Royal Society, ACM Fellow, Senior Principal Researcher at Microsoft Research. No doctoral degree of any kind. Really think he can't claim to be a scientist?

Scientist yes, in the same way that anyone who follows the scientific method can be a scientist.

Professor however, no, except as a honorary title.

I know exactly zero tenured professors who do not have a PhD.