U.S. head of government Barack Obama
Find the relation between <e1>U.S.<\e1> and <e2>Barack Obama<\e2>.
Amos J. Hochstein (born January 4, 1973) is a U.S. businessman, former diplomat and national security and energy expert. He has worked in the U.S. Congress, has testified before congressional panels and has served under the Barack Obama administration under Secretaries of State Clinton and Kerry. He was appointed Deputy Assistant Secretary of State in 2011 and as Special Envoy and Coordinator for International Energy Affairs. In 2015, President Barack Obama nominated Hochstein to be the Assistant Secretary of State for Energy Ressources. While at the State Department, Hochstein worked as a close advisor to Vice - President Joe Biden. He served in the administration from 2011 to 2017. In March 2017, he joined Tellurian, a private Houston - based LNG company, where he serves as Senior Vice President Marketing. He serves on the supervisory board of Naftogaz as well as the Board's of the Atlantic Council and U.S. - India Business Council. 
U.S. Barack Obama