"On a government-to-government level, we're making good progress," Emerson told The Associated Press in an interview. "I think in terms of the general public, there is perhaps a broader reaction and a little more skepticism about the value in the intelligence-sharing."
Given the extensive trade, investment, security and cultural ties between Germany and the U.S., Emerson believes the two governments can weather the NSA storm. But with the German public, which cherishes privacy and civil liberties after its painful history of Nazi and Communist dictatorships, he acknowledged: "It's just going to take time."
A poll this month of 1,002 Germans conducted by Germany's public television network ARD found only 35 percent of those surveyed consider the U.S. a trustworthy partner, down 14 percentage points from a July survey. France was considered the most trustworthy at 80 percent, the survey said. It gave a margin of error of plus or minus 3.1 percentage points.
The series of NSA revelations has also focused attention on other aspects of the U.S. military and its security role in Germany nearly a generation after the Cold War ended. The Sueddeutsche Zeitung, a leading German newspaper based in Munich, published an extensive report Friday, alleging that the presence of U.S. forces has made Germany the shadowy "indispensable partner" in the U.S. war against terrorism.
Emerson acknowledged that Germans were more sensitive to government eavesdropping than most Europeans because of the country's Nazi and Communist dictatorship. Apart from that, Germany has also faced far less of a threat from Islamic terrorism than the United States, Britain or France, whose publics are more tolerant of government surveillance.
Explaining the different perspectives to the different audiences is an important part of his job, Emerson said.
"I try to communicate that as important as it is for Americans to understand the German perspective, which based on German history, it is also important for Germans to understand the American perspective," he said. "There is not a single American over the age of 15 who doesn't have seared in their memory that image of planes going into buildings."