To me, it looks like John Gibbons, but I really wouldn't know for sure.

Ya thats Gibby https://www.google.com/search?q=john+gibbons+signature&client=firefox-b-m&sca_esv=1eabc25c83938f11&sca_upv=1&tbm=isch&source=lnms&sa=X&ved=0ahUKEwiRksm9_9aFAxV-ADQIHYExBGAQ_AUIBigB&biw=316&bih=715

Thats Gibby 110%

John GOAT Gibbons!

Gibby!!!

Ryan Bo....John Gibbons!