Alex Wellerstein is an Associate Professor in the Science and Technology Studies program at the Stevens Institute of Technology and a visiting researcher at the Nuclear Knowledges program, Center for International Studies, Sciences Po, Paris. He is the author of Restricted Data: The History of Nuclear Secrecy in the United States, and he has written for The New Yorker, Atlantic, Harper’s Magazine, and many other venues. He is perhaps best known as the creator of the NUKEMAP, the world’s most popular online nuclear weapons effects simulator. He is also the author of the Doomsday Machines blog, and he has taught at Harvard, MIT, and Georgetown University.

"Alex Wellerstein clears away the dead timber in this gripping investigation of President Truman’s relationship with the atomic bomb. I thought I knew the story but learned much that I didn’t know. Outstanding!" — Richard Rhodes, Pulitzer Prize Laureate for The Making of the Atomic Bomb“What if so much of what we always thought we knew about Truman’s use of the bombs wasn’t true? If Alex Wellerstein is right, you will never be able to have another discussion about the dropping of the atomic bombs in 1945 without taking into account the points made in this book. This is historical research at its best. It challenges long-held beliefs on the decision to use atomic weapons on Hiroshima and Nagasaki while highlighting why nuclear weapons evolved as they did after 1945.” — Dan Carlin, host of the Hardcore History podcast and author of the New York Times bestseller The End Is Always Near“Harry Truman presided over the only wartime use of nuclear weapons, and he also more forcefully checked military encroachments on this weapon than any subsequent commander-in-chief — all while the world descended into a rather hot Cold War. In this page-turning account, Alex Wellerstein brings us closer than we have ever been to understanding the paradoxes of how, through numerous actions and inactions, large and small, one quite ordinary man — perhaps because he was so ordinary — shaped the nuclear age.” — Michael D. Gordin, Professor of Modern and Contemporary History at Princeton University, author of Five Days in August: How World War II Became a Nuclear War"Mr. Wellerstein presents his story in clear, direct prose, incorporating the words of Truman, Secretary of War Henry Stimson, Manhattan Project commander Gen. Leslie Groves and others. He carefully dissects what they said and what they likely meant. His interpretive approach, refined over years of studying the nuclear threat, credibly sifts the historical record without slowing the book’s tempo. The Most Awful Responsibility is a well-written opus unpacking Truman’s—and America’s—complicated relationship with nuclear weapons." — The Wall Street Journal"A nuanced portrait of a president who shaped the modern nuclear age." — Kirkus Reviews"Many people think that the U.S. decision to use atomic bombs against Japan in 1945 was made by a pro-nuclear President Truman, hoping to persuade the Japanese to surrender to the Allies and end six years of war. But Wellerstein argues that this was not the case. . . . This must-read book takes readers on a journey through the use of atomic weapons as it relates to the geopolitical landscape and how the Hiroshima and Nagasaki bombing shaped current views on atomic weapons and deterrence." — Thomas O’Brien, Library Journal (Starred Review)A remarkable act of reading between the lines and a dark warning about how decisions unfold in the halls of power. — Publishers WeeklyThe Most Awful Responsibility is far more than a retelling of a familiar narrative. It has the potential to reshape prevailing interpretations of Truman’s role in the atomic bombings and of the influence he exerted in constructing the nuclear policy framework that endures to the present. Wellerstein’s work is among the most compelling contributions to a well-saturated field in many years. — Society for US Intellectual History

Alex Wellerstein is an Associate Professor in the Science and Technology Studies program at the Stevens Institute of Technology and a visiting researcher at the Nuclear Knowledges program, Center for International Studies, Sciences Po, Paris. He is the author of Restricted Data: The History of Nuclear Secrecy in the United States, and he has written for The New Yorker, Atlantic, Harper’s Magazine, and many other venues. He is perhaps best known as the creator of the NUKEMAP, the world’s most popular online nuclear weapons effects simulator. He is also the author of the Doomsday Machines blog, and he has taught at Harvard, MIT, and Georgetown University.

"Alex Wellerstein clears away the dead timber in this gripping investigation of President Truman’s relationship with the atomic bomb. I thought I knew the story but learned much that I didn’t know. Outstanding!" — Richard Rhodes, Pulitzer Prize Laureate for The Making of the Atomic Bomb“What if so much of what we always thought we knew about Truman’s use of the bombs wasn’t true? If Alex Wellerstein is right, you will never be able to have another discussion about the dropping of the atomic bombs in 1945 without taking into account the points made in this book. This is historical research at its best. It challenges long-held beliefs on the decision to use atomic weapons on Hiroshima and Nagasaki while highlighting why nuclear weapons evolved as they did after 1945.” — Dan Carlin, host of the Hardcore History podcast and author of the New York Times bestseller The End Is Always Near“Harry Truman presided over the only wartime use of nuclear weapons, and he also more forcefully checked military encroachments on this weapon than any subsequent commander-in-chief — all while the world descended into a rather hot Cold War. In this page-turning account, Alex Wellerstein brings us closer than we have ever been to understanding the paradoxes of how, through numerous actions and inactions, large and small, one quite ordinary man — perhaps because he was so ordinary — shaped the nuclear age.” — Michael D. Gordin, Professor of Modern and Contemporary History at Princeton University, author of Five Days in August: How World War II Became a Nuclear War"Mr. Wellerstein presents his story in clear, direct prose, incorporating the words of Truman, Secretary of War Henry Stimson, Manhattan Project commander Gen. Leslie Groves and others. He carefully dissects what they said and what they likely meant. His interpretive approach, refined over years of studying the nuclear threat, credibly sifts the historical record without slowing the book’s tempo. The Most Awful Responsibility is a well-written opus unpacking Truman’s—and America’s—complicated relationship with nuclear weapons." — The Wall Street Journal"A nuanced portrait of a president who shaped the modern nuclear age." — Kirkus Reviews"Many people think that the U.S. decision to use atomic bombs against Japan in 1945 was made by a pro-nuclear President Truman, hoping to persuade the Japanese to surrender to the Allies and end six years of war. But Wellerstein argues that this was not the case. . . . This must-read book takes readers on a journey through the use of atomic weapons as it relates to the geopolitical landscape and how the Hiroshima and Nagasaki bombing shaped current views on atomic weapons and deterrence." — Thomas O’Brien, Library Journal (Starred Review)A remarkable act of reading between the lines and a dark warning about how decisions unfold in the halls of power. — Publishers WeeklyThe Most Awful Responsibility is far more than a retelling of a familiar narrative. It has the potential to reshape prevailing interpretations of Truman’s role in the atomic bombings and of the influence he exerted in constructing the nuclear policy framework that endures to the present. Wellerstein’s work is among the most compelling contributions to a well-saturated field in many years. — Society for US Intellectual History

Alex Wellerstein is an Associate Professor in the Science and Technology Studies program at the Stevens Institute of Technology and a visiting researcher at the Nuclear Knowledges program, Center for International Studies, Sciences Po, Paris. He is the author of Restricted Data: The History of Nuclear Secrecy in the United States, and he has written for The New Yorker, Atlantic, Harper’s Magazine, and many other venues. He is perhaps best known as the creator of the NUKEMAP, the world’s most popular online nuclear weapons effects simulator. He is also the author of the Doomsday Machines blog, and he has taught at Harvard, MIT, and Georgetown University.

"Alex Wellerstein clears away the dead timber in this gripping investigation of President Truman’s relationship with the atomic bomb. I thought I knew the story but learned much that I didn’t know. Outstanding!" — Richard Rhodes, Pulitzer Prize Laureate for The Making of the Atomic Bomb“What if so much of what we always thought we knew about Truman’s use of the bombs wasn’t true? If Alex Wellerstein is right, you will never be able to have another discussion about the dropping of the atomic bombs in 1945 without taking into account the points made in this book. This is historical research at its best. It challenges long-held beliefs on the decision to use atomic weapons on Hiroshima and Nagasaki while highlighting why nuclear weapons evolved as they did after 1945.” — Dan Carlin, host of the Hardcore History podcast and author of the New York Times bestseller The End Is Always Near“Harry Truman presided over the only wartime use of nuclear weapons, and he also more forcefully checked military encroachments on this weapon than any subsequent commander-in-chief — all while the world descended into a rather hot Cold War. In this page-turning account, Alex Wellerstein brings us closer than we have ever been to understanding the paradoxes of how, through numerous actions and inactions, large and small, one quite ordinary man — perhaps because he was so ordinary — shaped the nuclear age.” — Michael D. Gordin, Professor of Modern and Contemporary History at Princeton University, author of Five Days in August: How World War II Became a Nuclear War"Mr. Wellerstein presents his story in clear, direct prose, incorporating the words of Truman, Secretary of War Henry Stimson, Manhattan Project commander Gen. Leslie Groves and others. He carefully dissects what they said and what they likely meant. His interpretive approach, refined over years of studying the nuclear threat, credibly sifts the historical record without slowing the book’s tempo. The Most Awful Responsibility is a well-written opus unpacking Truman’s—and America’s—complicated relationship with nuclear weapons." — The Wall Street Journal"A nuanced portrait of a president who shaped the modern nuclear age." — Kirkus Reviews"Many people think that the U.S. decision to use atomic bombs against Japan in 1945 was made by a pro-nuclear President Truman, hoping to persuade the Japanese to surrender to the Allies and end six years of war. But Wellerstein argues that this was not the case. . . . This must-read book takes readers on a journey through the use of atomic weapons as it relates to the geopolitical landscape and how the Hiroshima and Nagasaki bombing shaped current views on atomic weapons and deterrence." — Thomas O’Brien, Library Journal (Starred Review)A remarkable act of reading between the lines and a dark warning about how decisions unfold in the halls of power. — Publishers WeeklyThe Most Awful Responsibility is far more than a retelling of a familiar narrative. It has the potential to reshape prevailing interpretations of Truman’s role in the atomic bombings and of the influence he exerted in constructing the nuclear policy framework that endures to the present. Wellerstein’s work is among the most compelling contributions to a well-saturated field in many years. — Society for US Intellectual History