3. Christopher Hirata – IQ 225

At the age of 13, Christopher Hirata became the youngest American to win a gold medal at the International Physics Olympiad in 1996. One year later, at the tender age of 14, Hirata enrolled in the California Institute of Technology. At the age of 22, Christopher Hirata obtained his PhD from Princeton, before returning to California. He remained in California to this day, teaching astrophysics at the California Institute of Technology.