Johann Bernoulli was a Swiss mathematician born on July 27, 1667, in Basel, Switzerland. He is best known for his contributions to calculus and for being one of the early proponents of the calculus of variations. Johann was part of the famous Bernoulli family, which included several notable mathematicians. He played a significant role in the development of mathematical analysis and made important discoveries in areas such as differential equations and probability theory. Johann Bernoulli's work laid the groundwork for future mathematicians and influenced the field significantly until his death on January 1, 1748.