Katie Arrington lands in industry as CIO of quantum company IonQ

After leaving her role performing the duties of the chief information officer for the Department of Defense last month, Katie Arrington has taken a new position as CIO at quantum computing company IonQ. Arrington will step into the role Jan. 19, reporting to the company’s COO and CFO Inder Singh, IonQ announced Wednesday. Kirsten Davies was nominated by President Donald Trump in May 2025 to be the Defense Department CIO, and it took most of the remainder of 2025 for the Senate to confirm her into the role. She was sworn in just before the Christmas holiday, at which point Arrington stepped away from her service to the Pentagon. In joining IonQ, Arrington will serve on the company’s executive team. As CIO, Arrington will continue to support the U.S. military from a different vantage, leading modernization and security of IonQ’s enterprise systems in support of its mission to deliver quantum capabilities to American warfighters. Before rejoining the Pentagon a year ago, then as deputy CIO for cybersecurity, Arrington had a previous stint as CISO in the Office of the Undersecretary of Defense for Acquisition and Sustainment, where she was largely responsible for the development of the Cybersecurity Maturity Model Certification (CMMC) program.

Now: President Donald Trump re-nominated Sean Plankey to lead the Cybersecurity and Infrastructure Security Agency on Tuesday, after Plankey’s bid for the position ended last year stuck in the Senate. It’s not clear whether or how Plankey’s resubmitted nomination will overcome the hurdles that left many observers convinced his chance of becoming CISA director had likely ended, but it does definitively signal that the Trump administration still wants Plankey to have the job. Plankey’s nomination was included in a batch sent to the Senate announced on Tuesday. CISA spent all of 2025 under Trump without a permanent director. Trump nominated Plankey, who held a couple cybersecurity roles in the first Trump administration, to lead CISA in March. He got a Senate Homeland Security and Governmental Affairs Committee hearing in July, then won approval from that panel that same month. But Sen. Rick Scott, R-Fla., had placed a hold on Plankey’s nomination over a Coast Guard contract that the Homeland Security Department had canceled in part. While he awaited confirmation, Plankey had been serving as a senior adviser to the secretary for the Coast Guard. A spokesperson for Scott did not immediately respond to a request for comment. North Carolina’s GOP Senate delegation also had placed holds on DHS nominees related to disaster aid to their state. Sen. Thom Tillis, R-N.C., said last week that the holds would remain until Secretary Kristi Noem appeared before the Senate Judiciary Committee. A White House official had denied reports that Plankey’s nomination was all but over last year. “President Trump has been clear that he wants all of his nominees confirmed as quickly as possible, including Sean Plankey, who will play a key role in ensuring a strong cyber defense infrastructure,” the official told CyberScoop. Asked Wednesday at the Surface Navy Association national symposium about what he was doing to convince senators to lift their holds, Plankey answered, “The administration, the White House has to say that this is a priority of us.”

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