What Roman Catholic priest was a significant influence in the Ecological Movement of Thessaloniki?
Ecological Movement of Thessaloniki:  André Gorz, Ivan Illich and Cornelius Castoriadis were also significant influences. Ivan Illich: Ivan Illich ( ; 4 September 1926 – 2 December 2002) was a Croatian-Austrian philosopher, Roman Catholic priest, and critic of the institutions of modern Western culture, who addressed contemporary practices in education, medicine, work, energy use, transportation, and economic development.
Ivan Illich