Ashton Carter, who served as the secretary of defense under former President Barack Obama, died Monday after suffering a heart attack.

Carter served as the nation's 25th defense secretary and held the role from early 2015 to the end of the Obama administration in January 2017. During his tenure leading the Pentagon, Carter oversaw the military's campaign to defeat ISIS, opened all combat positions to women and ended the ban on transgender people serving in the armed forces.

He most recently led the Belfer Center for Science and International Affairs at Harvard University's John F. Kennedy School of Government.

Secretary Carter has spent more than three decades leveraging his knowledge of science and technology, global strategy and policy as well as his deep dedication to the men and women of the Department of Defense to make our nation and the world a safer place. He has done so in direct and indirect service of eleven secretaries of defense in both Democratic and Republican Administrations. Whether in government, academia, or the private sector, Secretary Carter has been guided by pragmatism and his belief in the boundless opportunities of the United States and has worked tirelessly to contribute to the ideas, policies, and innovations that assure our global leadership.

This book features his biography, political Career,how he was responsible for strategic affairs, including dealing with the threat of weapons of mass destruction elsewhere in the world, nuclear weapons policy (including overseeing the U.S. nuclear arsenal and missile defenses) etc.

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