Robert Bloch (-) is probably best remembered as the author of "Psycho." He was a long-time friend and protege of Lovecraft. Lovecraft based a character on him (Robert Blake in "The Haunter of the Dark" and dedicating a poem to him (obliquely).
[The Haunter of the Dark - H.P.L.]
[To Mr. Finlay upon his drawing for Mr. Bloch's The Faceless God - H.P.L.]
See also: Robert Blake