Question: What is the name of the American Boxing and MMA trainer who founded Grudge Training Center in 2009?
Sentence (from "Grudge Training Center"): To devote more attention to his sports equipment company ONX Sports, Wittman closed Grudge in November 2016, with Grudge trainer Jake Ramos opening the Genesis Training Center to assume most of Grudge's former personnel, membership and operations.
Relevant evidence: No