There are MANY well-known physicists among other physicists who are not well-known to the public. In fact, in each of the different field of studies in physics, there are plenty of "giants" in those fields who are quite well-known and prominent.
This is one such physicist in the field of condensed matter. Practically everyone in that field know Paul Canfield pretty well. And now it is your turn. This news article profiles this prolific physicist and what he does well.
There are many people who are not household names, but are significant contributors to the body of knowledge that we call Physics.