Austrian representant of the Training Committee of the European Association of Neurosurgery (until 1987),

Review board of "Stroke" (until 1986), 

Member of the Stroke Council of the American Heart Association (1990-)

Congress of Neurological Surgeons, CNS, (1987-) (US-based Association of Neurological Surgeons)

American Association of Neurological Surgeons, AANS, (2004-)

Austrian Society of Neurosurgery (since 1974)

German Society of Neurosurgery (since 1985)

Academia Eurasiana Neurochirurgica (1985-)

ISNII (International Society of Neurosurgical Instrument Inventors)

SMIT (Society of Minimally Invasive Therapy)

Rotary Graz. 1983-2003, Rotary Belvoir 2009-2015 (PP)

2000 - 2005 TWG-2 of EC - EHTEL

Since 2014 Oxford Philosophical Society