"It's no coincidence that the man who contributed the most to the study of human anatomy, the Belgian Andreas Vesalius, was an avid proponent of do-it-yourself, get-your-fussy-Renaissance-shirt-dirty anatomical dissection. Though human dissection was an accepted practice in the Renaissance-era anatomy class, most professors shied away from personally undertaking it, preferring to deliver their lectures while seated in raised chairs a safe and tidy remove from the corpse and pointing out structures with a wooden stick while a hired hand did the slicing. Vesalius disapproved of this practice, and wasn't shy about his feelings. In C. D. O'Malley's biography of the man, Vesalius likens the lecturers to "jackdaws aloft in their high chair, with egregious arrogance croaking things they have never investigated but merely committed to memory from the books of others. Thus everything is wrongly taught,...and days are wasted in ridiculous questions."