Bernhard Riemann
At first Riemann had no salary.  He depended on fees from the students.  After four years he was given a small salary.  In 1857 he became associate professor and in 1859 full professor, succeeding Dirichlet who had succeeded Gauss four years earlier.  Riemann suffered from bad health.  Overwork often resulted in periods of depression. There were many deaths in his family, but he worked very hard and made several discoveries that are now named after him.  He was becoming very famous.  On a visit to Berlin Borchardt, Kummer, Kronecker and Weierstraß - all very famous mathematicians - showered him with praise.  He went to Paris where he met Hermite who greatly admired him.  He was honoured by the Royal Society of London and the French Academy of Sciences.