The Professional Librarians Unit (LX) is a systemwide bargaining unit of non-supervisory professional librarians who provide vital services to maintain the highest quality academic, scientific and medical library facilities at all UC campuses and medical centers and the Lawrence Berkeley National Laboratory (LBNL). The unit is represented by the American Federation of Teachers (AFT). Currently, the unit includes approximately 342* employees.

An approximate breakdown of the number of Professional Librarians at each location is as follows:

Location Headcount
Berkeley 72
Davis (Campus & Medical Center) 31
Irvine (Campus & Medical Center) 26
Los Angeles (Campus & Medical Center) 95
Merced 9
Riverside 19
San Diego 41
San Francisco 9
Santa Barbara 21
Santa Cruz 19
Total 342

*GOA Data, October 2023