Naoko Takahashi (高橋 尚子, Takahashi Naoko, born May 6, 1972) is a retired Japanese long-distance runner and Olympic gold medal-winning marathoner. She won the gold medal in the marathon at the 2000 Sydney Olympics, and at the 2001 Berlin Marathon she became the first woman to complete a marathon in under 2 hours and 20 minutes.

Early years
Takahashi was born in Gifu, Gifu Prefecture on May 6, 1972, the eldest daughter of educator Yoshiaki Takahashi and his wife Shigeko.[1] Her father was a kindergarten principal. She is a second cousin-niece of chemist and Nobel Prize laureate Hideki Shirakawa.
Competitive career
Takahashi started running track in junior high school, and placed second in the 1500 meter and third in the 3000 meter races at the Japanese national collegiate championships while attending Osaka Gakuin University. Following graduation, she sought out the prominent distance running coach Yoshio Koide (coach) [ja] and began training under him. She supplemented her training regimen in Japan with altitude training in Colorado.
Takahashi competed in the finals of the 1997 World Championships 5000 meter race in Athens, where she finished in 13th place.
In March 1998, running in her second marathon, Takahashi set a Japanese women’s record of 2:25:48 at the Nagoya Women’s Marathon. Two months later, she won the 5000 meter race in the Osaka Japan Grand Prix with a time of 15:21.
Later in December of that same year, Takahashi set a new Japanese women’s marathon record when she won the Asian Games marathon in Bangkok with a time of 2:21:47 under very warm conditions.[3] She finished more than 13 minutes ahead of the second place finisher.
In March 2000, Takahashi earned a spot on Japan’s Olympic women’s marathon team after winning the Nagoya Women’s Marathon in a time of 2:22:19. She went on to win the women’s marathon at the 2000 Olympic Games in Sydney, with an Olympic record time of 2:23:14. It remained the fastest women’s Olympic marathon until 2012 in London. Following her gold medal victory, Takahashi received the 2000 AIMS Best Marathon Runner Award as well as Japan’s People’s Honour Award.
At the 2001 Berlin Marathon, Takahashi became the first woman to break the 2 hour 20 minute barrier, finishing in a world record time of 2:19:46 and more than eight minutes ahead of the second place finisher, the previous world record holder Tegla Loroupe. The following year, Takahashi won the 2002 Berlin Marathon with a time of 2:21:49.
During her running career, Takahashi suffered from a series of injuries. She announced her retirement in October 2008.

Source: wikipedia