2 0 1 5 ▁W itt man ▁founded ▁ON X ▁Sports , ▁a ▁combat ▁sports ▁equipment ▁company . ▁To ▁focus ▁more ▁attention ▁on ▁ON X ▁Sports , ▁W itt man ▁closed ▁down ▁Gr ud ge ▁in ▁November ▁ 2 0 1 6 , ▁though ▁he ▁continues ▁to ▁train ▁a ▁few ▁select ▁f igh ters , ▁including ▁Rose ▁Nam aj unas , ▁Justin ▁Ga eth je , ▁and ▁Matthew ▁L ope z . ▁ ▁Personal ▁life ▁W itt man ▁wrest led ▁at ▁Berlin ▁High ▁School , ▁after ▁which ▁he ▁moved ▁to ▁New ▁Jersey , ▁then ▁to ▁Colorado , ▁where ▁he ▁attended ▁the ▁Colorado ▁Institute ▁of ▁Art . ▁W itt man ▁married ▁wife ▁Christ ina ▁in ▁ 2 0 0 5 , ▁and ▁has ▁a ▁son ▁Terr ence ▁and ▁a ▁daughter ▁Mar issa . ▁ ▁Notable ▁M MA ▁f igh ters ▁trained ▁ ▁Mike ▁W essel ▁ ▁John ▁Howard ▁ ▁Matt ▁Mit r ione ▁ ▁Roy ▁Nelson ▁ ▁Ty ler ▁Ton er ▁ ▁Ger ald ▁Harris ▁ ▁Pat ▁Barry ▁ ▁Rose ▁Nam aj unas ▁ ▁Ty ler ▁St inson ▁ ▁Luke ▁Ca ud illo ▁ ▁James ▁Mc S ween ey ▁ ▁Tod d ▁D uff ee ▁ ▁Donald ▁C err one ▁ ▁Jon ▁Mad sen ▁ ▁Neil ▁Mag ny ▁ ▁J ared ▁Ham man ▁ ▁Ed ▁H erman ▁ ▁St ipe ▁Mi oc ic ▁ ▁Justin ▁Sal as ▁ ▁Georges ▁St - Pierre ▁ ▁Br andon ▁Th atch ▁ ▁R ash ad ▁Evans ▁ ▁Sh ane ▁Car win ▁ ▁Mel vin ▁Gu ill ard ▁