Ashton B. Carter is a prominent figure in American politics, known for his service as the 25th United States Secretary of Defense from 2015 to 2017 under President Barack Obama. A member of the Democratic Party, Carter has had a distinguished career in public service and academia, focusing on national security and defense policy. He has also held various positions within the Department of Defense and has been involved in significant defense initiatives and reforms during his tenure. Carter is recognized for his expertise in technology and its implications for military strategy.