Question: What American historian, playwrite, and social activist followed Paul Metcalf's prose?

Context paragraphs:
Whale Wars: Whale Wars is a weekly American documentary-style reality television series that premiered on November 7, 2008 on the Animal Planet cable channel.  The program followed Paul Watson, founder of the Sea Shepherd Conservation Society, as he and the crew aboard their various vessels stopped illegal killing of whales by Japanese science vessels (whalers) off the coast of Antarctica.

Dorothy Day: Dorothy Day, Obl.S.B.  (November 8, 1897 – November 29, 1980) was an American journalist, social activist, and Catholic convert.  Day initially lived a bohemian lifestyle before gaining fame as a social activist after her conversion.  She later became a key figure in the Catholic Worker Movement and earned a national reputation as a political radical, perhaps the most famous radical in American Catholic Church history.

Howard Zinn: Howard Zinn (August 24, 1922January 27, 2010) was an American historian, playwright, and social activist.  He was a political science professor at Boston University.  Zinn wrote more than twenty books, including his best-selling and influential "A People's History of the United States".  In 2007, he published a version of it for younger readers, "A Young People′s History of the United States".

Paul Metcalf: Paul Metcalf (1917–1999) was an American writer.  He wrote in verse and prose, but his work generally defies classification.  Its small but devoted following includes Robert Creeley, William Gass, Wendell Berry, Guy Davenport, Howard Zinn, and Bruce Olds.  His many books include "Will West" (1956), "Genoa" (1965), "Patagoni" (1971), "Apalache" (1976), "The Middle Passage" (1976), "Zip Odes" (1979), and "U.S. Dept. of the Interior" (1980).

Max Elbaum: Max Elbaum is an American historian, author, and social activist.  He has written extensively about the New Left, Civil Rights Movement and anti-war movement.  His book on the "new communist movement" of the 1970s and 1980s, "Revolution In The Air: Sixties Radicals turn to Lenin, Mao and Che", was praised by Pulitzer Prize-winning historian David Garrow as "an absolutely first-rate work of political scholarship".

John Mohawk: John Mohawk (30 August 1945 – 13 December 2006) was an American historian, writer, and social activist.

Review of Contemporary Fiction: The Review of Contemporary Fiction is a tri-quarterly journal published by Dalkey Archive Press.  It features a variety of fiction, reviews and critical essays on literature that has an experimental, avant-garde or subversive bent.  Founded in 1980 by the publisher John O'Brien, the The Review of Contemporary Fiction originally focused upon American and British writers who had been overlooked by the critical establishment, and in this manner the Review succeeded in bringing new critical attention to writers such as William Gaddis, Gilbert Sorrentino, Paul Metcalf, Nicholas Mosley, Donald Barthelme, and many others.  In 1984, in order to begin reprinting some of these authors, John O'Brien founded Dalkey Archive Press.

Marcella Grace Eiler: Marcella "Sali" Grace Eiler (September 30, 1987 – September 15, 2008) was an American social activist from Eugene, Oregon who was raped and murdered in Mexico two weeks before her 21st birthday.  For the last three years of her life, she had been living and working intermittently in Oaxaca's provincial capital, Oaxaca de Juárez, as a dance teacher and social activist, and acted as an observer for an indigenous rights organization.

Woodland Pattern Book Center: Woodland Pattern Book Center is a nonprofit organization in Milwaukee, Wisconsin's Riverwest neighborhood that seeks to present small press literature, readings, visual art, and experimental music with a focus on contemporary practice.  The organization was founded in 1979.  It is named for a line in a poem published in Paul Metcalf's "Apalache."

The Jargon Society: The Jargon Society is an independent press founded by the American poet Jonathan Williams.  Jargon has published seminal works of the American literary avant-garde, including books by Charles Olson, Louis Zukofsky, Paul Metcalf, James Broughton, and Williams himself, as well as "sui generis" books of folk art such as "White Trash Cooking".

Supporting paragraphs: Paul Metcalf Howard Zinn
Answer: Howard Zinn