Schreiber is a graduate of the State University of New York at Buffalo Law School and has been practicing immigration law in the nonprofit sector for over 30 years. As a CLINIC attorney, she provides technical assistance and training to member agencies and other organizations and practitioners across the country.

After law school, Schreiber worked at the Legal Assistance Foundation of Metropolitan Chicago for eight years, and then became managing attorney at the Midwest Immigrant Rights Center from 1988 to 1998.

Before joining CLINIC in 2001, Schreiber worked at the DePaul Law School legal clinic as a supervisor of law students representing asylum applicants and providing technical assistance to community-based organizations. She is a member of the Illinois state bar.