Championnats du monde de vol à ski
He won a silver medal in the team large hill event at the 1982 FIS Nordic World Ski Championships in Oslo. Wallner's best finish at the Winter Olympics was 6th in the individual large hill at Innsbruck in 1976. He finished fifth in the FIS Ski-Flying World Championships 1975. Wallner's lone ski jumping victory came in a large hill event at Sapporo in 1981. After retiring he coached the Italian national team for a period.