Skip to main content
Leonhard Euler
Photo: Popperfoto via Getty Images/Getty Images

Leonhard Euler

  • Publish date:
Leonhard Euler was an 18th century physicist and scholar who was responsible for developing many concepts that are an integral part of modern mathematics.

Who Was Leonhard Euler?

Leonhard Euler was one of math's most pioneering thinkers, establishing a career as an academy scholar and contributing greatly to the fields of geometry, trigonometry and calculus, among many others. He released hundreds of articles and publications during his lifetime, and continued to publish after losing his sight. 

Early Life and Education

Leonhard Euler was born on April 15, 1707, in Basel, Switzerland. Though originally slated for a career as a rural clergyman, Euler showed an early aptitude and propensity for mathematics, and thus, after studying with Johan Bernoulli, he attended the University of Basel and earned his master's during his teens. Moving to Russia in 1727, Euler served in the navy before joining the St. Petersburg Academy as a professor of physics and later heading its mathematics division.

He wed Katharina Gsell in early 1734, with the couple going on to have many children, though only five lived past their father. The couple were married for 39 years until Katharina's death, and Euler remarried in his later years to her half-sister.

In 1736, he published his first book of many, Mechanica. By the end of the decade, having suffered from fevers and overexertion due to cartography work, Euler was severely hampered in the ability to see from his right eye.

Heads Academy of Science

In the mid-1740s, Euler was appointed the mathematics director of the newly created Berlin Academy of Science and Beaux Arts, taking on a variety of management roles as well becoming head of the organization itself for a time starting in 1759. Not appointed president proper of the academy by King Frederick II, Euler received patronage from Catherine II and in 1766 returned to Russia to head the St. Petersburg Academy.

Scroll to Continue


US actor Miles Teller poses during a photocall for the film "Too Old To Die Young - North of Hollywood, West of Hell" at the 72nd edition of the Cannes Film Festival in Cannes, southern France, on May 18, 2019.

Miles Teller

WASHINGTON, DC - MARCH 02:  Ranking member U.S. Rep. Barney Frank (D-MA) questions U.S. Federal Reserve Chairman Ben Bernanke as he testifies at a hearing on receiving 'the Monetary Policy Report to the Congress required under the Humphrey-Hawkins Act' at the House Financial Services Committee in the Rayburn House Office Building on Capitol Hill on March 2, 2011 in Washington, DC. Bernanke reportedly defended the Federal Reserves monetary policy against criticism from Republicans.  (Photo by Jonathan Ernst/Getty Images)

Barney Frank

NEW YORK - OCTOBER 02:  Actor  Ben Whishaw attends the 48th New York Film Festival premiere of 'The Tempest' at Alice Tully Hall on October 2, 2010 in New York City.  (Photo by Astrid Stawiarz/Getty Images) *** Local Caption *** Ben Whishaw

Ben Whishaw

By the early 1770s, Euler had lost his sight completely after not allowing for proper recuperation after an operation. Yet, with a mind that remained highly agile, he was able to continue his scientific work and with assistance published scores of articles.

Revolutionary Principles

Over his career, Euler came up with an array of principles which laid the foundation for much of modern mathematics as we know it. He was a revolutionary thinker in the fields of geometry, trigonometry, calculus, differential equations, number theory and notational systems—including the utilization of π and f(x)—among a legion of other accomplishments. His Euler's Identity theorem is often cited as the most delightful of equations and his work also focused on the fields of astronomy/lunar motion, acoustics, mechanics and music.

Euler was a highly prolific author, having written hundreds of papers and publications over his lifetime, including the well-known science and philosophy series Letters to a German Princess.

Death and Legacy

Euler, working on the day of his passing, suffered from a brain hemorrhage and died during the night of September 18, 1783, in St. Petersburg.

Euler's legacy has been enormous in terms of shaping the modern playing field of mathematics and engineering, with his work highlighted by the Mathematical Association of America and honored by mathematicians around the world. A massive project that has taken more than a century to complete, Leonhardi Euleri Opera Omnia is a full presentation of his work and has had dozens of volumes published over the years. The last two Opera Omnia volumes are tentatively scheduled for a 2014 release date.

Fact Check

We strive for accuracy and fairness. If you see something that doesn't look right, contact us!