An avid student of French existentialism and a serious collector of modern jazz LPs, Donald Harrison Sr. was not your average Mardi Gras Indian Big Chief. One of the real-life models for “Big Chief” Albert Lambreaux in the much-heralded HBO series Treme, Big Chief Donald Harrison Sr. was a tireless reader and accomplished street-corner philosopher who in 1988 formed his own tribe, The Guardians of the Flame, and remained a lifelong proponent of the cen...