Career
As many fellow biathletes Sumann picked up the sport switching from cross-country skiing he had been doing since childhood. By mid-1990s he entered junior ski team of Austria and he made it onto the senior level later on. He was a skillful sprinter at the time.
Sumann started as a biathlete in 2000 and competed in biathlon at the top level for 11 seasons.
His most brilliant season was the 2009-2010 Biathlon World Cup. Sumann retired from the sport at the end of the 2013-2014 season.
All results are sourced from the International Biathlon Union. Olympic Games
3 medals (2 silver, 1 bronze)
*Mass start was added as an event in 2006, with the mixed relay being added in 2014.
World Championships
4 medals (2 silver, 2 bronze)
*During Olympic seasons competitions are only held for those events not included in the Olympic program
**Mixed relay was added as an event in 2005. Individual victories
6 victories (1 In, 1 Sp, 2 Pu, 2 Mississippi).