[3][4] In August 2022, Christensen was appointed Chargé d'Affaires of the U.S. Mission to the International Civil Aviation Organization (ICAO), succeeding Chesley "Sully" Sullenberger.
[6] In December 2023, it was announced Christensen will teach at Brigham Young University, having retired from the State Department.
[7] On June 18, 2021, he was awarded an Honorary Doctor of Social Science from National Sun Yat-sen University (NSYSU).
[8] On June 24, 2021, Christensen was awarded Grand Medal of Diplomacy by Taiwan's ministry of foreign affairs.
[9] On June 25, 2021, Christensen was conferred Presidential Office Order of the Brilliant Star with Grand Cordon by Taiwan's president Tsai Ing-wen.