Stefan Hierzer was born in 1959 in Mitterdorf, Styria. He completed his apprenticeship at the Hotel Sacher in Vienna from 1975 to 1978. He then worked at the Hotel Panhans on the Semmering in 1984. In 1986 he became the sous chef at the Hotel Imperial and a year later moved over to the Plachutta.
In 1987, Chef Stefan Hiezer returned to the Hotel Imperial as executive chef and ten years later in the fall of 1997, the Great Chefs television crew showed up to tape him for two of their new series: Great Chefs of Austria for ORF, and for the Discovery Channel, Great Chefs of the World.
Twenty years after first working at the Hotel Imperial, Chef Hierzer moved on, catering to the hospitality industry.