Peter Elbow [...]

From Wikipedia:

Peter Elbow is a Professor of English Emeritus at the University of Massachusetts Amherst, where he also directed the Writing Program from 1996 until 2000. He writes about theory, practice, and pedagogy, and has authored several books and a number of papers. His practices in regard to editing and revising are now widely accepted and taught as the writing process. The invention technique freewriting is dubbed as a “student-centered movement”.

Elbow supported a policy of Minimal Grading.