When she was seven, she skied for the first time. On January 24, 1993, she started in a slalom in Haus / Ennstal (AUT) for the first time in the World Cup, making her the youngest American woman to have ever competed in a World Cup race. She wore the number 33 and finished in 103.59 seconds, at the same time 5.35 seconds behind the winner Patricia Chauvet , 21st place, which meant her first WC and FIS points.
Koznick won six World Cup races (all in slalom) during her career. Although she was among the world's top slalom drivers for many years, she never succeeded at the Olympic Games or World Championships and was able to demonstrate her capabilities at a major event: at the 2001 World Championships in St. Anton am Arlberg she achieved her best result in eighth place. At the Olympic Games in Nagano in 1998 as well as in Salt Lake City in 2002, she was eliminated in slalom, in the giant slalom in 2002 she finished 17th. At the World Championships she never crossed the finish line with 19th place except in Sierra Nevada in 1996. In the giant slalom she achieved 15th place in St. Anton 2001, 12th in St. Moritz 2003 and 23rd in Bormio 2005. With fourth place in Sölden at the beginning of the 2004/05 season, she also achieved a top position in the giant slalom for the first time .
On July 11, 2006 Koznick announced her resignation. Overall, in addition to six victories, she was on the podium 14 times in the World Cup and made it into the top ten a total of 54 times. In 1998 and 2002 she finished second in the Slalom World Cup and was the best female slalom driver in the USA for eleven years. She was five times US champion, took part in three Olympic Games, in which she injured herself in the first slalom run in Turin in 2006; Started with N ° 6, she finished 34th, did not start in the 2nd run because of her injury and did not take part in the giant slalom. An injury sentenced her to watch in 1994 in Lillehammer. In her last season two 4th places were her best results.
^ FIS: Fédération Internationale de Ski (International World Ski Federation); FIS points are awarded on the basis of different criteria than WC points.