Employees in the GEO bargaining unit work as either Graduate Student Instructors (GSI) or Graduate Student Staff Assistants (GSSA). There are approximately 2,210 Graduate Student Instructors (GSI) and 53 Graduate Student Staff Assistants (GSSA) on the Ann Arbor, Dearborn and Flint campuses as of October 2025.
GSI/GSSA Headcount by Ann Arbor Campus Unit
| Unit |
Members |
| A. Alfred Taubman College of Architecture and Urban Planning |
29 |
| College of Engineering |
446 |
| College of Literature, Science and Arts |
1,230 |
| College of Pharmacy |
22 |
| Ford School of Public Policy |
21 |
| Marsal Family School of Education |
26 |
| Medical School |
40 |
| Rackham Graduate School |
7 |
| Ross School of Business |
11 |
| School for Environment and Sustainability |
51 |
| School of Information |
100 |
| School of Kinesiology |
27 |
| School of Music, Theatre and Dance |
129 |
| School of Public Health |
57 |
| School of Social Work |
6 |
| Stamps School of Art and Design |
11 |
GSI/GSSA Headcount by Dearborn Campus Unit
| Unit |
Members |
| Dearborn College of Engineering |
50 |
GSI/GSSA Headcount by Flint Campus Unit
| Unit |
Members |
| Flint College of Arts and Sciences |
0 |
GSI/GSSA Headcount by Campus Unit Totals
| Unit |
Members |
| Ann Arbor Campus Total |
2,213 |
| Dearborn Campus Total |
50 |
| Flint Campus Total |
0 |
| All Campus Total |
2,263 |