Leah Esguerra (right), who is credited with being the first social worker installed directly at a public library, strolls through the fifth floor of the San Francisco Public Library’s main branch, joined by the library’s health and safety associates (from left to right) Sidney Grindstaff, Jennifer Keys and Cary Latham.

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Leah Esguerra (right), who is credited with being the first social worker installed directly at a public library, strolls through the fifth floor of the San Francisco Public Library’s main branch, joined by the library’s health and safety associates (from left to right) Sidney Grindstaff, Jennifer Keys and Cary Latham.