John Holt taught in schools for six years, and was an advocate for school reform. When it became apparent that reform would not happen he turned his efforts to promoting home education. He wrote prolifically, including ten books, many articles, and America's first home education newsletter. Even though much of his work was published in the 1970s-1980s it remains relevant today, and his books are still a source of inspiration for many homeschooling parents. See some of his inspiring quotes here.