Dr Liberti has worked, operated, collaborated and conducted research and training initiatives in Neurosurgery in the following Italian and foreign University and Private Specialist Centers and Hospitals:

• Germany: Aachen (Prof J. Gilsbach and Prof H. Bertalanffy, Bochum (Prof A. Harders), Freiburg (Prof W. Seeger), Hannover (Prof M. Samii), Mainz (Prof A. Perneczky)
• Austria: Vienna (Prof M. Tchabitcher)
• USA: Raleigh and Durham -N.C.- (Prof. T. Fukushima), West Palm Beach-FL- (T. Fukushima), Pittsburgh-PEN- (Prof H.D.Jho),Richmond VIRG- (Prof T. Fukushima), St Louis – MISS-(Prof. O.Al Mefty)
• Japan: Tokyo, Nagoya, Takayama, Osaka, Kobe, Fukuoka, Fukuyama, Nagasaki, Kagoshima (Prof. T. Fukushima), Sapporo (Prof R. Tanikawa & Prof H.Kamiyana)
• Switzerland: Lucerne (Prof. V. Dolenc)

SURGICAL SKILLS: performed operations on

• Vascular Malformations (Aneurysms, AVMs, Angiomas, Trigeminal, Facial and Glossogpharyngeal Nerve Conflicts, FAVD) in every cerebral and spinal vascular district;
• Benign and malignant tumor pathologies intracerebral, intracerebellar, in the brainstem, in the spinal cord (Gliomas, Metastasis) and extramedullary cervical dorsal and lumbar (Meningiomas, Neuromas);
• Localized and extensive complex tumor pathologies of the skull base (sphenopetroclival meningiomas, neurinomas, adenomas, craniopharyngiomas); of Minimal Invasive Neurosurgery on degenerative pathologies of the Spinal Column (herniated discs, stenosis, etc.)