At Phaidon:
John Quinn is joining the company as CFO, effective January 27.
Siobhan Bent has been promoted to v-p of global marketing and publicity.
Ellie Levine has been promoted to global director of digital marketing.
Emma Tsankov has joined the company as social media manager.
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John Sellers has been promoted to senior director, publicity, at HarperCollins Children's Books. He was previously director, publicity.