Gustav Rivinius has been a professor at the Hochschule für Musik Saar for many years. In June 2014 he was appointed as professor at the Conservatorium Maastricht (The Netherlands).
Interested students can find all information here:
Hochschule für Musik Saar (admission exams probably in June)
Conservatorium Maastricht (admission exams probably in May)
Moreover, he teaches at summer academies and master classes:
Vienna, March 30 - April 4
Radolfzell am Bodensee, August 4-12
Cervo/Italy, August 31 - September 13