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He survived Auschwitz.
Then his story really began.

Siggi Wilzig arrived in America with nothing and built a life no one could have imagined. Unstoppable is not just a story of survival, but of ambition, reinvention, and what happens after everything is lost.
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  • author A book by
    Joshua M. Greene
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Book Reviews

See what our readers are saying.
"A man of courage and faith."
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Elie Wiesel
Nobel Laureate
"Unquestionably the most articulate and dynamic survivor I’ve ever met."
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Barry Farber
Legendary radio talk show host
"Given his lack of any formal education, Siggi’s business acumen was incredible, and his life was a testament to human endurance—heroic and unparalleled."
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Marc Bell
Chairman & CEO, Terran Orbital
"Siggi was someone who would look at the Himalayan mountains and say, 'I can climb that.'"
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Rodgin Cohen
Esq., Senior Chair, Sullivan & Cromwell
"Hard work, intuition, and faith helped guide Siggi through the horrors of Auschwitz to the upper echelons of the business world. Though he never escaped the trauma of his memories, his experiences will now educate and inspire others."
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Marc Leder
Co-CEO, Sun Capital
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Who This Book Is For

Entrepreneurs

Siggi’s rise from penniless immigrant to Wall Street powerhouse offers a masterclass in grit, strategic thinking, and unstoppable resilience in business.

History Buffs

The book delivers a deeply researched, vivid account that bridges Holocaust history with post-war American social and economic transformation.

Holocaust & Jewish Studies

Siggi’s story provides a rare, firsthand narrative of survival, identity, and moral courage, told through the lens of a man who rebuilt his life with extraordinary purpose.

Leaders & Executives

Wilzig’s leadership style—rooted in loyalty, intuition, and fearless advocacy—offers powerful lessons for anyone responsible for guiding teams or organizations.

Immigrant Success Story Enthusiasts

The book captures the quintessential American immigrant journey, showing how determination and character can overcome impossible beginnings.
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About The Author

JOSHUA M. GREENE (Justice at Dachau: The Trials of an American Prosecutor) is a renowned Holocaust scholar and filmmaker whose biographies have sold more than a half-million copies worldwide. Greene is a popular lecturer who has spoken at the Pentagon and before the Judge Advocate General’s College, and his documentaries on Holocaust history have aired on PBS and Discovery. He has appeared on national media outlets from NPR’s Fresh Air with Terry Gross to FOX News, CNN, and more.