Hallett began her diplomatic career in the Office of Iranian Affairs and the State Department Operations Center in Washington, DC, as well as assignments at the U.S. consulates general in Monterrey, Mexico, and Jeddah, Saudi Arabia.[5]
Her diplomatic career continued in assignments such as deputy chief of mission at the U.S. Embassy in Nicosia, Cyprus, and deputy chief of mission at the U.S. Embassy in Muscat, Oman. She also worked as deputy director of the Executive Secretariat Staff in Washington, DC, and held roles such as political and economic section chief at the U.S. Embassy in Manama, Bahrain, and deputy political counselor at the U.S. Embassy in Cairo, Egypt.[5]
On July 21, 2023, Hallett was appointed chargé d'affaires ad interim at the U.S. Embassy in Jerusalem. Prior to this role, she served as deputy chief of mission in Israel and also held the position of acting senior director for the Middle East and North Africa, as well as director of Gulf affairs at the National Security Council.[6]
In her first tweet as embassy chief, she thanked former U.S. ambassador to Israel Thomas R. Nides for his "commitment to ensuring that the ties between the U.S. and Israel remained ironclad." She expressed support for U.S.-Israel relations, saying "I look forward to continuing the work of reinforcing the unshakable bond between the US and Israel as the U.S. Embassy in Israel’s chargé d’affaires." Nides told The Times of Israel that Hallett "is as good as it gets. A brilliant, experienced senior foreign service officer. I am leaving the embassy in great hands."[2]
In September, the Biden administration expressed it would not confirm another ambassador to Israel before the 2024 U.S. presidential election because of the difficulties in getting such an appointment confirmed by the Senate in the current political climate in the U.S. and the time it would consume. This meant Hallett would continue her role as chargé d'affaires ad interim at the U.S. Embassy in Jerusalem until 2024.[7] However the US Senate decided to nevertheless approve the presumptive nominee by Joe Biden, former U.S. Treasury Secretary Jack Lew, in a fast-tracked vote due to October 2023 Hamas attack on Israel, meaning Hallett’s tenure ended and she returned as deputy chief.[8][9]
Amid the October 7 attacks, Hallett said she was "sickened by the images coming out of southern Israel of dead and wounded civilians at the hands of terrorists from Gaza." She affirmed that the United States stands with Israel.[10]
According to Reuters, in February 2024, Hallett and Lew blocked distribution of several cables written by USAID staffers which described the severity of humanitarian conditions in Gaza at the time in the midst of the ongoing war. One included descriptions of human bones left on roads and "catastrophic human needs, particularly for food and safe drinking water". Hallett and Lew prevented further distribution of the reports within the government as they believed they were insufficiently balanced.[11]
Hallett once again served as chargé d'affaires ad interim at the U.S. Embassy in Jerusalem from January 2025 to April 2025 after Jack Lew resigned in accordance with a new administration, with her being succeeded by Mike Huckabee nominated by Donald Trump and approved by the US Senate.[12]
On September 2, 2025, Donald Trump nominated Hallett for the position of Ambassador to Bahrain,[13] a position for which she had previously been nominated by the Biden administration. She was confirmed by the Senate on October 7, 2025,[14] and presented her credentials to King Hamad bin Isa Al Khalifa of Bahrain on January 20, 2026.[15]
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