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 364* employees.

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

Location Headcount
Berkeley 75
Davis (Campus & Medical Center) 31
Irvine (Campus & Medical Center) 31
Los Angeles (Campus & Medical Center) 98
Merced 9
Riverside 19
San Diego 45
San Francisco 10
Santa Barbara 29
Santa Cruz 17
Total 364

*FTP Data, April 2021