Doherty previously led BTI, a packet optical company acquired last year by Juniper Networks, and security company Arbor Networks, and early in his career had numerous roles at Nortel.
Dyn Founder Jeremy Hitchcock stepped down as CEO in May, a day after the 15-year-old company announced a $50 million investment round.
Doherty takes the reins at Dyn as the company makes its push to help enterprises migrating to hybrid and public clouds. Dyn counts organizations such as SoundCloud, BT, Hershey and Twitter among its customers.
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