By the early seventeenth century…
– Ivan Illich

Ivan Dominic Illich (2 December 2002) was an Austrian Roman Catholic priest, theologian, philosopher, and social critic. His 1971 book Deschooling Society criticises modern society's institutional approach to education, an approach that constrains learning to narrow situations in a fairly short period of the human lifespan. His 1975 book Medical Nemesis, importing to the sociology of medicine the concept of medical harm, argues that industrialised society widely impairs quality of life by overmedicalising life, pathologizing normal conditions, creating false dependency, and limiting other more healthful solutions. Illich called himself an errant pilgrim.'