Born in Davos in 1939 Stiffler played ice hockey in his youth. He studied hotel management in
Lausanne and was owner of the Hôtel Club in
Davos. In the late 1990s, when Standard Liège was facing financial trouble, businessman
Robert Louis-Dreyfus saved the team from bankruptcy at the request of , who entrusted the presidency to Stiffler. He succeeded in October 2000 after his involvement in the rescue of
Olympique de Marseille in the early 1990s. Despite his role as president of Standard Liège, he continued to live in Davos, which let to Lucien D'Onofrio taking the vice-presidency. Consequently, Stiffler left the club. Stiffler died on 10 January 2025, at the age of 85. ==References==