John Taylor Gatto was a teacher in New York city public schools for 30 years and was the winner New York City Teacher of the Year on three occasions. He has become an outspoken critic of the compulsory American education system and has some thought provoking things to say.
"There was not a single day that I went to work as a school teacher...when I did not have a clear intention...to wreak some harm to forced institutional schooling." -John Taylor Gatto
If you enjoy this talk I also recommend watching the documentary film "A Touch of Greatness" about Albert Cullum.