Besides his competitive accomplishments at the 1920 Olympics, Karl Frederick captained the U.S. Olympic shooting team in 1948. He later became president of the National Rifle Association and a vice-president of the U.S. Revolver Association. Frederick attended Princeton, graduating in 1903, and then entered Harvard Law School, from which he earned an LL.B. in 1908. He made his career as a practicing lawyer in New York City for many years. He was also active in environmental causes, serving as chairman and president of the New York State Conservation Council and as a senior board member and Vice-Chairman of the executive committee of the American Forestry Association.