Jeremiah Greenleaf was an American publisher and writer. Around 1820, Greenleaf submitted his version of an English grammar, which could teach a pupil the subject in as little twelve days, to the approbation of both Thomas Jefferson and John Adams. Both men sent encouraging, if brief, replies. Greenleaf remained dedicated to education and also published geographic works in an attempt to better the educations of the American people. Examples of his work include the New Universal Atlas, which appeared in several editions in the 1840s.