About Lindsay Oliver
Lindsay Oliver
Author · Executive · Strategist · Investigator
Lindsay Oliver is an award-winning undercover investigator and writer who has spent more than two decades exposing some of the world's most hidden industries.
She has personally conducted or overseen more than a hundred investigations across research laboratories, animal agriculture, zoos, circuses, and other systems that operate largely out of public view.
Her work has generated major media coverage, helped drive corporate and legislative change, and is featured in the documentary Eating Animals, produced by Natalie Portman.
Transitioning from frontline fieldwork to executive leadership, Lindsay has led multimillion-dollar organizations. She is currently the Executive Director of Animals International US and the founder and CEO of Justify, a nonprofit supporting lab workers and innovative science.
Her debut book, Marshmallows Are Their Favorite, draws on her time working undercover at one of only seven U.S. National Primate Research Centers. It is a fast-paced true story about secrecy, deception, unexpected connections, and the monkeys hidden behind locked doors.
She writes with the precision of someone who's lived the truth and the conviction of someone who will never forget.
Leadership & Affiliations
Where the work continues
Animals International US
Executive Director
Leading the US arm of a global organization working to end the exploitation of animals across industries worldwide.
Justify
Founder & CEO
A nonprofit supporting laboratory workers and advancing innovative, non-animal science.
The Field
Investigator · 20+ Years
More than a hundred investigations across labs, agriculture, zoos, circuses, pet stores, puppy mills, and beyond.
"I felt like I used to live relatively unaware, and then someone suddenly turned on a light, but that light only exposed more darkness."
— Lindsay Oliver
Pre-Order Marshmallows Are Their Favorite by Lindsay Oliver
Undercover at a Primate Lab
One investigator. Four months undercover. Getting in was the easy part. On sale October 6, 2026.
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