Chirichella has served as executive vice president-CFO since 2011.
Young resigned last Thursday after reports surfaced that he had made inappropriate sexual comments at work.
He became president of the magazine group in July 2018.
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According to Swartz's memo, Chirichella and other senior executives “will lead a process of listening and discussion so that we can together plot the course for the next stage of our magazine company’s transformation."
Talent officer Keesha Jean-Baptiste “will continue to lead a number of initiatives to further diversify and make our magazine company a more inclusive place for all of us,” he added.
Hearst Magazines owns Cosmopolitan, Esquire and Harper’s Bazaar, among other publications.