**Karl Theodor Wilhelm Weierstraß** (October 31, 1815 - February 19, 1897) was a German mathematician who is oft cited as the "father of modern analysis".
He was born in Ostenfelde, Westphalia (today Germany) and died in Berlin, Germany.

*See also:*

- Bolzano-Weierstrass theorem
- Stone-Weierstrass theorem
- Weierstrass-Casorati theorem
- Weierstrass function
- Weierstrass M-test
- Weierstrass preparation theorem
- Lindemann-Weierstrass theorem