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Crisis and emergency management firm Witt O’Brien’s LLC, a subsidiary of Seacor Holdings Inc., announced that Devin Sirmenis joined the firm as managing director of corporate resilience.

Sirmenis has worked with clients such as Fortune 500 executives on crisis management for the past 20 years. He arrives from Deloitte Touche Tohmatsu Ltd., where he led the firm’s strategic risk services. He previously worked at Booz Allen Hamilton Inc., where he provided advisory services to the U.S. Department of Defense.

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