Which college was Jack Lambert playing for when he entered the NFL?

Which college was Mike Singletary playing for when he entered the NFL? What jersey number did Mike Singletary wear with the Bears? What position did Jack Lambert primarily play? Jack Lambert is best known for playing with which NFL team? What jersey number did Jack Lambert wear with the Steelers? What position did Joe Greene primarily play? Joe Greene is best known for playing with which NFL team? Which college was Joe Greene playing for when he entered the NFL?