Together with his partner Alexander Resch he won at the 2002 Olympic Games in Salt Lake City and the gold medal at the 2010 Olympic Games bronze medal in doubles. 1999, 2003 and 2007 were both German masters. At the 2006 Olympic Games in Turin, the favored double finished only sixth place. Four years later, Leitner and Resch arrived at the Olympic Games in Vancouver in the last race of her career in third place after they were in the first run only on rank 5, and won the bronze medal. In addition, the starting for the WSV Koenigssee Leitner, together with Resch, 1999, 2000, 2004 and 2007 world champion in doubles. The duo from Berchtesgaden reached the record number of 34 World Cup victories in ten career years. Leitner was a sports soldier in the rank of Sergeant in the sports promotion group of the Bundeswehr in Berchtesgaden. Since April 2009, he studied at the Cologne Academy coach. The three-year -job training he strive for the conclusion of Certified Coaches. At the same time he works as a clerk at the Federal Police Sports School in Bad Endorf. He traininert there among other things, the Olympic champion Felix Loch and Geisenberger.