Nathan Ghar-jun Adrian (born December 7, 1988) is an American swimmer and three-time Olympic gold medalist who currently holds the American record in the 50 and 100-yard freestyle (short course) events.

In his Olympic debut at the 2008 Summer Olympics, Adrian swam in the heats of the 4×100-meter freestyle relay and earned a gold medal when the United States team won in the final. Four years later, at the 2012 Summer Olympics, Adrian won gold medals in both the 100-meter freestyle and the 4×100-meter medley relay, and a silver medal in the 4×100-meter freestyle relay. He has won a total of fifteen medals in major international competition, twelve gold, two silver, and one bronze spanning the Olympics, the World, and the Pan Pacific Championships.

Personal life
Adrian was born in Bremerton, Washington in 1988. He is the son of James and Cecilia Adrian; his mother Cecilia (梁潔雲) is Chinese and was born and raised in Hong Kong. Cecilia is a nurse for the Bremerton school district, and his father James is a retired nuclear engineer for the Puget Sound Naval Shipyard. Adrian has an older sister, Donella, who swam at Arizona State University, and an older brother, Justin, who swam at the University of Washington. Adrian started swimming at the age of five because of the influence of his siblings. He was a 2006 graduate, swimming for Bremerton High School. Adrian matriculated at the University of California, Berkeley in fall 2006, where he majored in public health. He eventually graduated with honors in the spring of 2012. At Cal, Adrian is a five-time individual NCAA champion: Winning the 50-yard freestyle in 2009 and 2011 and the 100-yard freestyle in 2009, 2010, and 2011.

Career
2008 Short Course World Championships 
At the 2008 Short Course World Championships, Adrian won gold in the 100-meter freestyle and 4×100-meter freestyle relay and silver in the 4×100-meter medley relay. In the 4×100-meter freestyle relay, Adrian combined with Ryan Lochte,Bryan Lundquist and Doug Van Wie won gold in a world record time of 3:08.44. In his second event, the 100-meter freestyle, Adrian won gold in a time of 46.67, just ahead of Filippo Magnini who finished second with a time of 46.70.For his last event, the 4×100-meter medley relay, Adrian combined with Randall Bal, Mark Gangloff and Ryan Lochte, won silver behind Russia.

2008 Beijing Summer Olympic Games 
See also: Swimming at the 2008 Summer Olympics
At the 2008 United States Olympic Trials, Adrian placed fourth in the 100-meter freestyle, qualifying him to swim in the 4×100-meter freestyle relay at the Olympics. He also placed sixth in the 50-meter freestyle.

At the 2008 Summer Olympics in Beijing, Adrian swam the first leg in the preliminary heats of the 4×100-meter freestyle relay, splitting a time of 48.82 seconds. Cullen Jones, Ben Wildman-Tobriner and Matt Grevers completed the relay with a final time of 3:12.23, a world record. This record was broken one day later when Michael Phelps, Garrett Weber-Gale, Cullen Jones and Jason Lezak swam a time of 3:08.24, beating France and Australia in the final. By swimming in the heats, Adrian earned a gold medal even though he didn't swim in the final.

Adrian was training under coach Mike Bottom in the Florida Keys as part of The Race Club swimming training program World Team leading up to the 2008 Olympics.

2009 World Championships 
See also: Swimming at the 2009 World Aquatics Championships
At the 2009 National Championships, Adrian placed first in the 50-meter and 100-meter freestyle events, qualifying him to swim at the 2009 World Aquatics Championships in Rome.

At the 2009 World Aquatics Championships, Adrian earned gold in the 4×100-meter freestyle relay and the 4×100-meter medley relay. Adrian also placed sixth in the 50-meter freestyle and tenth in the 100-meter freestyle. AfterMichael Phelps, Ryan Lochte and Matt Grevers completed their legs in the 4×100-meter freestyle relay, the United States had a slight deficit behind the Russian team. However, Adrian swam the anchor leg in 46.79 to overtake Danila Izotovfor first place. The final time of 3:09.21 was a championship record. In the 4×100-meter medley relay, Adrian contributed in the heats (with Matt Grevers, Mark Gangloff and Tyler McGill) and earned a gold medal when the U.S. team placed first in the final.

2010 
At the 2010 National Championships, Adrian qualified to compete at the 2010 Pan Pacific Swimming Championships by winning the 50-meter and 100-meter freestyle titles. His win in the 100-meter freestyle also guaranteed him a spot on the 4×100-meter freestyle and 4×100-meter medley relay teams.
At the 2010 Pan Pacific Swimming Championships, Adrian won a total of four gold medals, the best performance of his career. In his first event, the 100-meter freestyle, Adrian won the gold medal in 48.15, beating Canadian Brent Hayden and world-record holder in the 100-meter freestyle César Cielo. The following day, Adrian lined up alongside Michael Phelps, Ryan Lochte and Jason Lezak to anchor the 4×100-meter freestyle relay. With no competition, Adrian recorded a time of 47.51 and the U.S. team won the gold in a time of 3:11.74. The following day, Adrian then competed in the 50-meter freestyle and the 4×100-meter medley relay. In the final of the 50-meter freestyle, Adrian shocked favorite Cielo, winning in a time of 21.55 seconds; Cielo finished second in 21.57. About an hour and a half later, Adrian competed in the 4×100-meter medley relay with Aaron Peirsol, Mark Gangloff and Michael Phelps. Swimming the freestyle leg, Adrian recorded a time of 47.54, the fastest in the field and the U.S. team won the gold in a time of 3:32.48.

2011 
2011 World Championships 
See also: Swimming at the 2011 World Aquatics Championships
Adrian won his first medal, a bronze, in the 4×100-meter freestyle relay with Michael Phelps, Garrett Weber-Gale and Jason Lezak. Swimming the anchor leg, Adrian recorded a time of 47.40. In the final of the 100-meter freestyle, Adrian placed sixth with a time of 48.23, well off his semifinal time of 48.05. In the 50-meter freestyle final, Adrian placed fourth with a time of 21.93 seconds, just one one-hundredth (0.01) of a second ahead behind third-place finisher Alain Bernard. In his last event, the 4×100-meter medley relay, Adrian teamed with Mark Gangloff, Michael Phelps, and Nick Thoman to win gold in a time of 3:32.06. Swimming the freestyle leg, Adrian had a time of 47.64.

2011 National Championships
At the 2011 National Championships, Adrian defended his 50-meter freestyle title with a time of 21.84 seconds. His time moved him to fourth in the world behind César Cielo (21.52), Bruno Fratus (21.76), and Frédérick Bousquet(21.78). He chose to sit out of the 100-meter freestyle in order to prepare for the 2012 Summer Olympics.

2012 Summer Olympic Games
See also: Swimming at the 2012 Summer Olympics
At the 2012 U.S. Olympic Trials in Omaha, Nebraska, the qualifying meet for the 2012 Olympics, Adrian made the U.S. Olympic team for the second time by finishing first in his first event, the 100-meter freestyle. In the final of the 100-meter freestyle, Adrian posted a time of 48.10 seconds to finish ahead of Cullen Jones, who had a time of 48.46. He also placed third for the 50-meter freestyle with a time of 21.68, just missing a spot in that event.
At the 2012 Summer Olympics in London, Adrian won his first medal, a silver, in the 4×100-meter freestyle relay with Michael Phelps, Cullen Jones and Ryan Lochte, with the team finishing behind France. Swimming the lead-off leg, Adrian recorded a split of 47.89 seconds, and the team finished with a final time of 3:10.38. Adrian's lead-off time was the fastest first leg in the field, and Adrian's first time breaking 48 seconds.

On the fifth day of competition, Adrian won the gold medal in the 100-meter freestyle final, defeating favorite James Magnussen of Australia by one one-hundredth (0.01) of a second. In the race, Adrian set a new personal record with a time of 47.52. Going into the 100-meter freestyle final, Adrian was seeded second with a time of 47.97, which was only the second time he ever broke 48 seconds in the event. In winning the 100-meter freestyle, Adrian became the first American male to win the event since Matt Biondi did in 1988.
Adrian won a second gold medal as a member of the winning U.S. team in the 4x100-meter medley relay on the final day of competition. He swam the anchor freestyle leg, with Matt Grevers swimming the backstroke leadoff leg, Brendan Hansenthe breaststroke second leg, and Michael Phelps the butterfly third leg. The Americans recorded a time of 3:29:35, with the Japanese team taking the silver medal and the Australians receiving the bronze. In the race, Adrian had a split of 46.85, the fastest in the field.