Margaret Yesso Watson, 72, principal librarian for Alameda County (Calif.) Library for 12 years, died June 26. Watson’s career in libraries spanned 50 years, including work as a public health and medical librarian for Santa Clara County, California; Technicon Data Systems, and public health agencies in London and Sydney. She also worked as a regional manager for a library placement agency in California and as a public librarian for Oakland (Calif.) Public Library. Watson frequently spoke at library schools and meetings, and she regularly mentored new librarians and library paraprofessionals.