John Tsukayama is a writer, investigator, and educator whose career has centered on managing risk, assessing threats, and making consequential decisions under pressure. For decades, his work has focused on situations where failure carried real human, institutional, or personal costs.

He is best known in Hawaiʻi for being a leader in the State Attorney General’s investigation of the Bishop Estate trustees in the late 1990s—one of the most complex and politically sensitive corruption investigations in the state’s history. That work required not only forensic investigation, but careful management of institutional and personal risk amid intense public scrutiny.

Across his professional life, John has specialized in investigations involving corruption, abuse of authority, deception, and coercion. His work has required evaluating credibility, managing adversarial environments, and acting decisively when information was incomplete and the margin for error was narrow.

He also led teams that defused potential mass shootings at workplaces and schools, applying structured threat assessment to prevent violence before it occurred. Much of his career has involved determining not just what happened, but what could happen next if risks were misunderstood or ignored.

John holds advanced degrees in international relations and terrorism studies. His academic research has focused on interrogation, torture, and state violence in the post-9/11 War on Terror, examining how democratic institutions justify extreme measures under perceived threat. That work culminated in By Any Means Necessary (2019), which draws on both scholarly research and professional experience to examine how democracies rationalize moral compromise—and what those choices cost over time.

Lived With Purpose reflects a more personal dimension of that same life. Written for his grandchildren, the memoir offers true stories about work, family, faith, loyalty, and moral judgment. It is not a professional autobiography, but a record of how a life shaped by high-stakes work is lived at home, across generations, and in quieter moments.

In addition to investigative work, John spent years teaching investigation, political philosophy, and critical thinking to university students. His teaching emphasized judgment, restraint, and responsibility—especially in environments where authority, fear, and moral compromise intersect.

John lives in Hawaiʻi with his family. When he is not writing, he spends his time reading, teaching informally, cooking, and enjoying the ordinary rhythms of family life.