In 2017, George Glass was nominated by President Donald Trump to become Ambassador Extraordinary and Plenipotentiary of the United States of America to the Republic of Portugal.
The United States Senate confirmed his nomination on August 3, 2017.
He presented to credentials to the President of the Portuguese Republic, Marcelo Rebelo de Sousa, on August 25, 2017.

During his tenure as Ambassador, Glass has sought to increase economic activity between the United States and Portugal, including on agricultural and energy issues.
 He has also been vocal in warning about Chinese investments in strategic sectors in Portugal.
 He has raised concerns over a proposed takeover by China Three Gorges of the Portuguese energy company EDP.
 He has also been outspoken about U.S. concerns about the role Huawei might play in future 5G networks in Portugal and elsewhere.
 In March 2020, he wrote an op-ed about disinformation and the COVID 19 epidemic.
 
Glass and his wife, Mary, have also been active in supporting Portuguese communities recovering from wildfires and in reforestation.
 In October 2017, George and Mary visited communities affected by wildfires from that year in the district of Viseu.
  In October of 2019, they founded the U.S-Portugal Friendship Forest near Leiria and hosted the signing of a sister-park initiative between North Cascades National Park and the Portuguese National Park of Peneda-Geres.

In September 2019, Glass had named the Ambassador’s Residence in Lisbon after former Ambassador and Secretary of Defense Frank Carlucci, who served as Ambassador to Portugal from 1975 to 1978.
 
On November 14, 2019, Secretary of State Mike Pompeo presented Glass with the Sue Cobb Award for Exemplary Diplomatic Service.
In 2017, George Glass was nominated by President Donald Trump to become Ambassador Extraordinary and Plenipotentiary of the United States of America to the Republic of Portugal. The United States Senate confirmed his nomination on August 3, 2017. He presented to credentials to the President of the Portuguese Republic, Marcelo Rebelo de Sousa, on August 25, 2017.
During his tenure as Ambassador, Glass has sought to increase economic activity between the United States and Portugal, including on agricultural and energy issues.  He has also been vocal in warning about Chinese investments in strategic sectors in Portugal.  He has raised concerns over a proposed takeover by China Three Gorges of the Portuguese energy company EDP.  He has also been outspoken about U.S. concerns about the role Huawei might play in future 5G networks in Portugal and elsewhere.  In March 2020, he wrote an op-ed about disinformation and the COVID 19 epidemic.  
Glass and his wife, Mary, have also been active in supporting Portuguese communities recovering from wildfires and in reforestation.  In October 2017, George and Mary visited communities affected by wildfires from that year in the district of Viseu.  In October of 2019, they founded the U.S-Portugal Friendship Forest near Leiria and hosted the signing of a sister-park initiative between North Cascades National Park and the Portuguese National Park of Peneda-Geres. 
In September 2019, Glass had named the Ambassador’s Residence in Lisbon after former Ambassador and Secretary of Defense Frank Carlucci, who served as Ambassador to Portugal from 1975 to 1978.  
On November 14, 2019, Secretary of State Mike Pompeo presented Glass with the Sue Cobb Award for Exemplary Diplomatic Service.
George Edward Glass