Mathematics involves study of concepts related to quantity, structure, space and also change. Mathematics has evolved from counting, calculation, measurement and the study of shapes and motion of physical objects.
Mathematics has not been founded by a single person. It has developed over a period of centuries and the efforts and contributions of various people has made it what it is today. It evolved through a series of abstractions specifically that of numbers and counting. This was followed by elementary arithmetic. Then there came the system for recording numbers.
The first known numerals were created by Egyptians and the decimal system and the concept of zero was created in the Indus valley civilization. So as such there is no single founder of the subject.