[3][4] Shiao served as an intelligence briefer to the United States attorney general and Director of the Federal Bureau of Investigation from 2005 to 2007.

As Deputy Director for Intelligence during 2016–2019, she led the NCTC's all-source analysis of the capabilities and intentions of terrorist actors worldwide to inform national policymakers and support the efforts of the intelligence community, military, law enforcement, and homeland security partners.

[1] Shiao was NCTC's Executive Director from March 2019 to April 2020, a role in which she managed the center's financial and personnel operations and helped drive information technology innovation.

Shiao then served as Deputy Director of the NCTC from April to October 2020.

[1] During this time, Shiao was Acting Director of the NCTC from April 3 to August 10, 2020, when she was replaced by Christopher C.