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 353* employees.

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

Location Headcount
Berkeley 74
Davis (Campus & Medical Center) 27
Irvine (Campus & Medical Center) 29
Los Angeles (Campus & Medical Center) 93
Merced 9
Riverside 22
San Diego 40
San Francisco 13
Santa Barbara 29
Santa Cruz 17
Total 353

*FTP Data, Oct. 2017