**Birthdate:**April 15, 1707

**Sun Sign:**Aries

**Birthplace:**Basel

**Died:**September 18, 1783

Leonhard Euler was a Swiss physicist, mathematician, logician, geographer, astronomer, and engineer. He is credited with making influential and important mathematical discoveries, such as *graph theory *and *infinitesimal calculus*. Widely regarded as one of the **greatest and most prolific mathematicians of all time**, Leonhard Euler also made pioneering contributions to* analytic number theory* and *topology*.