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Prior to Duo Security Welch was COO of cybersecurity firm Zscaler Inc which went public in 2018 NeutralNEW YORK IronNet Cybersecurity Inc a startup led by former U.S. National Security Agency chief Keith Alexander has appointed William Welch as cochief executive the company told Reuters on Monday http://www.reuters.com/news/technology/article/us-ironnet-executives/former-executive-of-duo-security-zscaler-joins-ironnet-as-co-ceo-idUSKCN1Q01O12019-02-12