Umbra magazine (1963-1974) An Introduction and…
https://library.buffalo.edu/pl/pdf/15.1-among-the-neighbors.pdf
30 Oct 2023:
Dent notes that layout was by artist William E. (Bill) Day, and typing by Mildred Hernton. ... Organised by Tonya Foster, and featuring discussion with Steve Cannon, David Henderson, Rashidah Ismaili, Joe Johnson, and Ishmael Reed.