HOW IS YOUR ENGLISH?

Something like Enrico Poincaré, I don't remember the details.

Poincaré developed topology, but topology is just a prelude to General Relativity. And yes, as I clarified, he also worked on Lorentz transformations and Special Relativity, but again, that's not it. Besides, Poincaré and Einstein worked on some things in parallel.

I was most impressed when I learned about Landau; he left a lot behind.

Well, Landau is certainly a genius, I don't argue with that.