Euler was born in Switzerland but worked much of his life in either Berlin or St Petersburg.
At university he was taught by Johan Bernardi and after graduating became a member of the mathematics department in St Petersburg university. He was appointed professor of mathematics department and a few years later professor of physics.
Six years later he moved back to Berlin because of various restrictions, and because of weather was too hard.
During the seven years of war Euler's property and home were damaged by Russian troops. The Russian Army General stepped in and paid reparations, and then the Russian Empress, Catherine the Great, paid a very substantial sum as compensation.
Perhaps in recognition of this generosity Euler decided to return to St Petersburg, especially after the favorable terms for himself and his family was obtained, also how his sons were to be pointed, at an appropriate time, to high positions in the government in the 1800s.
Not only did Euler bring great mathematics to the Russian city, but he also brought great prestige. Catherine wanted St Peterburg to be a major center of Western education.
Because of health problems he became blind effectively by 1771.
His response to his blindness was that he would now be less distracted by outside events.
In the last years of his life, he was averaging an original research paper at the rate of one a week, using a scribe and dictating for memory.
Euler died in 1783 .
Euler was one of the greatest mathematicians to have ever lived. Both Gauss and Laplace assessed him as the greatest.