Leonhard Euler was a Swiss mathematician and physicist, and he was primarily a speaker of German. Born in 1707 in Basel, Switzerland, Euler’s early education was conducted in his native language. However, during his career, he spent significant time in different countries and cultures, particularly in Russia and Germany, where he communicated in both German and French.
In his prolific writings, including numerous papers and books on mathematics and physics, Euler used both German and French. As the language of scientific discourse evolved, his works also contributed to the establishment of a more universal language in science. Euler’s ability to communicate in multiple languages allowed him to reach a wider audience and collaborate with great minds of his time.