Eric Lidji is a man who cares deeply about modest ambitions. He has lived in Pittsburgh on and off for 20 years. It is a city perfectly sized to his sensibility, neither very small nor very large—a place known to but mostly ignored by those who do not live there. Lidji, 36, has held many jobs; most recently, in late 2017, he became the director and only permanent staff member of the Rauh Jewish History Program & Archives, a repository of early-20th-century local Yiddish-theater posters as well as records from dozens of small-town synagogues in western Pennsylvania. But even before he became an archivist, Lidji’s work has always been the same: He is a diarist of small delights, a chronicler of curios, an ardent psalmist of Pittsburgh’s quirky charms.