American athlete
Source (Wikipedia): Hal Connolly

Harold Vincent “Hal” Connolly was an American athlete and hammer thrower from Somerville, Massachusetts. He won a gold medal in the hammer throw at the 1956 Summer Olympics in Melbourne. Connolly became the first American to throw a hammer more than 200 feet. He set his first of six world records just prior to the 1956 Olympics, and held the world record for nearly 10 years.