Sieminski was sworn in Monday.
The energy statistical and analytical agency gained the new executive from Deutsche Bank, where he served as chief energy economist from 2005 to this year.
During his tenure, Sieminski worked with global commodities research and training units and was responsible for forecasting energy market trends.
From March through last month, while awaiting his administrator confirmation, he also served as a senior director on the staff of the National Security Council.
Sieminski’s background also includes time as a senior advisor to the Energy and Natural Resources Program at the Center for Strategic and International Studies, and as an advisory board member of the Global Energy and Environment Initiative at Johns Hopkins/SAIS.
The Cornell graduate is also a senior fellow and ex-president of the US Association for Energy Economics and served as president of the National Association of Petroleum Investment Analysts.
“EIA is truly fortunate to have Adam Sieminski as its new administrator to lead the agency at a time when both domestic and international energy issues are at the forefront of the national discourse,” secretary of energy Steven Chu said.
Sieminski said he was grateful for the agency’s confidence in him for what he called an “important assignment”
“As a customer of EIA for virtually my entire professional career, I can attest to the fact EIA's mission is as critical today as when it was created by Congress in 1977.”
Sieminski takes the helm from the agency’s seventh administrator Richard Newell, who was appointed in August 2009. He resigned from the post last July to pursue an academic career.