Turtel Onli (born January 25, 1952 in Chicago, Illinois) is an American artist, entrepreneur, author, art therapist, educator, and publisher. Over Onli's career, his work has touched upon a variety of disciplines in fine and applied visual art, producing works in painting, drawing, illustration, publishing, fashion, and multimedia production. Onli has authored and illustrated numerous comic books and graphic novels, including NOG, Protector of the Pyramids, Malcolm 10, Nog Nu and Grammar Patrol. He is known as "the Father" of the "Black Age of Comics," a movement dedicated to the promotion, creation, and support of Afrocentric comic books and graphic novels. Onli coined the term "Rhythmism" to define and interpret his stylizations, which fuse primitive and futuristic concepts. A public school art teacher, now retired, Onli worked in the Chicago Public Schools for more than two decades.