sentences:  He then worked from 1966 to 1967 as Staff Attorney with the Center on Social Welfare Policy and Law at Columbia University, one of the earliest poverty law centers.There he litigated the groundbreaking case "Goldberg v. Kelly", which established due process rights for welfare recipients.The theory of the case was developed by Robert Cover, who was then a student at Columbia and went on to become Wizner's colleague as a professor at Yale Law School.