The Aristotle University of Thessaloniki (often called the Aristotelian University or University of Thessaloniki) is the sixth oldest and among the most highly ranked tertiary education institutions in Greece. It is the largest university in Greece and in the Balkans. It is named after the philosopher Aristotle, who was born in Stageira, about 55 km east of Thessaloniki. Its campus covers 230,000 square metres in the centre of Thessaloniki, with additional educational and administrative facilities elsewhere. More than 73,000 students study at the Aristotle University, 65,026 in undergraduate programmes and 8,472 in postgraduate programmes, of which 3,952 at Doctoral level. The Teaching and Research Staff number 2,024 people. There are additionally 248 members of the Special Laboratory Teaching Personnel, 213 members of the Special Technical Laboratory Personnel. The administrative staff consists of 400 permanent employees and 528 subcontractor employees that are contracted by the university. The language of instruction is Greek, although there are programs in foreign languages and courses for international students, which are carried out in English, French, German, and Italian.