Interestingly, his seminal papers on (alongside other major contributions) solving the Poincaré conjecture weren't published in a journal but were simply upload

Interestingly, his seminal papers on (alongside other major contributions) solving the Poincaré conjecture weren't published in a journal but were simply uploaded on arXiv. Moreover, similar to GP's mathematician may say, Grigori quit professional mathematics not just to avoid fame but also due to disappointment over the field ethics.