Chairman of the Neurosurgery Department, Montpellier University Medical Center, Montpellier, France

UPMC Center for Cranial Base Surgery, Departments of Otolaryngology and Neurological Surgery,The Eye & Ear Institute, Pittsburgh, PA, USA

Dept. of Surgery, University of Sao Paulo Medical School;

Neurosurgeon at Hospital Israelita

Albert Einstein, Sao Paulo, Brazil 

Dept. of Neuropathology, University of Heidelberg,

CCU Neuropathology, German Cancer Center, Heidelberg, Germany