Christopher Wren was an English architect, astronomer, and mathematician, born on October 20, 1632. He is best known for designing many notable buildings in London, including the iconic St. Paul's Cathedral. Wren's work is characterized by its innovative use of space and light, blending classical and modern styles. In addition to his architectural achievements, Wren was a prominent scientist and a founding member of the Royal Society. He played a significant role in the rebuilding of London after the Great Fire of London in 1666, contributing to the city's transformation with his visionary designs.