"Mean" Joe Greene Autographed UNT Mean Green Authentic Helmet with Beckett COA. Charles Edward Greene, better known as "Mean" Joe Greene, was defensive tackle for the Pittsburgh Steelers from 1969 to 1981. We was the centerpiece of the "Steel Curtain" defense that went to 4 super bowls and 10 pro bowls. He was the fourth overall pick in the 1969 draft out of the University of North Texas.