Nyman first skied at the age of two. At the age of eight, he competed in his first race in the Sundance ski area , where his father ran a ski school. At the age of 17, he joined the training group of former US national coach Rob Clayton in Park City in 1999 and began to regularly take part in the FIS races held in North America . This step paid off. In 2002 he made the jump into the squad of the US team for the Junior World Championship in Tarvisio, Italy . There he duped the European competition and surprisingly became junior world champion in slalom. He also won the silver medal in the Alpine Combined. Six days after the end of the World Cup, on March 9, 2002, Nyman made his debut in the World Cup at the slalom in Altenmarkt-Zauchensee and went straight to 15th place.
His further sporting development was then hampered by a broken left leg, which he suffered while skateboarding after the 2001/02 season . In the summer of 2002 he was hardly able to train as a result. Via FIS races and starts in the European Cup , he fought his way back to the top US drivers and celebrated a successful comeback in March 2003 by winning the US downhill championship. On January 22, 2004, he broke his left leg again in a European Cup race. After he had already reached a few top 10 places in the Nor-Am and European Cup in the 2004/05 season , he was injured again shortly before the start of the World Cup, which is why he had to pause for four weeks. In April 2005 he won the US Downhill Championship for the second time. Since his many injuries, Nyman has mainly concentrated on the faster downhill and super-G disciplines as well as the super combination.
Since the 2005/06 season , Nyman has been regularly participating in the World Cup races. In his Olympic debut in 2006 in Turin he reached the best ranking in 19th place in the downhill. On December 1, 2006, he came third on the downhill from Beaver Creek on the podium for the first time in the World Cup and on December 16, 2006 he celebrated his first World Cup victory in the downhill from Val Gardena . So he reached tenth place in the downhill world cup in the 2006/07 season . At the 2007 World Championships in Åre , his best result was ninth place in the super combination. The third World Cup podium was achieved by Nyman on November 30, 2007 in the downhill from Beaver Creek, where he was second five hundredths of a second behind Michael Walchhofer .
In January 2009, Nyman was injured in a fall on the Lauberhorn run in Wengen . He had to take a break for a few weeks and therefore missed the World Cup in Val-d'Isère. At the 2010 Winter Olympics , he was 20th in the downhill and 13th in this discipline at the 2011 World Championships in Garmisch-Partenkirchen . In the World Cup, Nyman drove two or three times under the fastest 20 in the 2009/10 and 2010/11 seasons . He also started again in the Nor-Am Cup and won the downhill classification in the 2009/10 season . On November 8, 2011, Nyman suffered a ruptured left Achilles tendon while training downhill at Copper Mountain . He could therefore not take part in any races in the 2011/12 season.
In his comeback season 2012/13 , Nyman surprisingly won the World Cup descent on the Saslong in Val Gardena with the high start number 39 . He celebrated his second World Cup victory, almost exactly after six years when he first won the World Cup downhill run in Val Gardena. Two years later he was able to repeat this success and won the descent on the Saslong for the third time. Once again on December 17, 2016, it was this slope in the South Tyrolean Alps that brought him his first podium finish of the new season. On January 27, 2017, he had a hard crash on the first of the two downhill runs in Garmisch-Partenkirchen , which meant that he was unable to participate in the remaining races.
Private
In addition to his sporting activities, Nyman is also socially committed with the support of the A Child's Hope Foundation . In Haiti he helped set up an orphanage for 32 children.