He continued his mathematics studies on his own and earned money by giving private lessons before returning to the University of Pisa in 1589 to teach math. Galileo left the school in 1585 without earning a degree. Instead, though, he became interested in mathematics and shifted his focus to that subject.
When he was 16, Galileo enrolled at the University of Pisa to study medicine, at his father’s urging. As a pre-teen, Galileo began studying at a monastery near Florence and considered becoming a monk however, his father wasn’t in favor of his son pursuing a religious life and eventually removed him from school.
Although his father was from a noble family, they weren’t wealthy. Galileo, whose father was a lute player and music theorist, was born in Pisa, Italy.