The old factory director put duty above self and never used his position to benefit his family.
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From the Book of Later Han biography of 祭遵 (后汉书·祭遵传): 遵为人廉约小心,克己奉公 - 'he was honest, frugal, careful; he restrained himself and served the public.' A standard phrase for praising incorruptible officials ever since.
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Formal, laudatory. Common in official biographies, obituaries, and Party discourse. Pair with 两袖清风 (clean sleeves, untainted by graft) or 鞠躬尽瘁 (bending fully to duty).