From 1979 to 1985 , he worked at the company 's own educational facility teaching mathematics and statistics .
In 1977 , Royen started working as a statistician for the pharmaceutical company Hoechst AG .
From 1979 to 1985 , Royen worked at the company 's own educational facility teaching mathematics and statistics .
In 1977 , Royen started working as a statistician for the pharmaceutical company Hoechst AG .