Kolmogorov's contribution did not have any real initial impact, it was met with lukewarm reception. You might enjoy reading "The origins and legacy of Kolmogoro

Kolmogorov's contribution did not have any real initial impact, it was met with lukewarm reception. You might enjoy reading "The origins and legacy of Kolmogorov’s Grundbegriffe" for a longer exposition on his most well-known work. Boltzmann was likely bipolar and suffered from bouts of intense depression. His suicide was partly due to his long feud with philosophy, but I think a larger contributor was probably his own mental issues.