He was the president of the Fédération Internationale des Sociétés d'Aviron (FISA), the International Rowing Federation, from 1949 or 1950 (sources differ) until his death.
He was piloting a plane near the Parc de Mon Repos in Lausanne when the engine lost power.
Mullegg was killed in the crash and his two passengers, French rowers Jean Méry and Louis Patricot, suffered serious injuries.
[2] Mullegg is credited with conceiving the idea of having World Rowing Championships.
The first world championships had been planned for 1958 in Philadelphia but at the FISA congress in 1957, the Americans withdrew from organising the event.