This story is from The Hill by Maggie Miller:

[Christopher] Krebs served as a DHS adviser during the George W. Bush administration, working on issues including defending Defense Department networks against foreign threats, and then moved over to Microsoft to lead its policy work on cybersecurity and technology issues. 

He returned to DHS in 2017, initially to serve as an adviser to former Homeland Security Secretary John Kelly. Following Kelly’s departure and the promotion of Kirstjen Nielsen to the secretary position, Krebs became what he described as the “accidental director” first of NPPD, then the newly formed [Cybersecurity and Infrastructure Security Agency (CISA)], with the Senate voting to confirm him in 2018. 

“I didn’t anticipate necessarily being in this role, I didn’t necessarily anticipate the agency being here. I just wanted to come in and make a difference,” Krebs said. 

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