Matthew Centrowitz Jr. is an American middle-distance runner, who specializes in the 1500 metres. He won a gold medal in the event at the 2016 Summer Olympics in Rio de Janeiro. He also achieved a bronze medal at the 2011 World Championships and a silver medal at the 2013 World Championships. Centrowitz is a five-time national champion in the 1500 m at the USA Outdoor Track and Field Championships.

Arnold, a census-designated place (CDP) in Anne Arundel County, Maryland, United States, located just outside of the state's capital, Annapolis. It is located 18.78 miles south of Baltimore, and 29.97 miles east of Washington, D.C. The population was 23,106 at the 2010 census. Neighborhoods straddle College Parkway and Maryland Route 2. Arnold is located on the scenic Broadneck Peninsula. The ZIP code is 21012. It is bordered by Severna Park to the northwest, Cape Saint Claire to the southeast, Annapolis to the southwest, and Lake Shore to the northeast.