Niki Papadopoulos is Editor-in-Chief of Portfolio. In this role she oversees the acquisition and packaging strategy for the Portfolio and Thesis imprints. Niki is a passionate believer in nonfiction as a powerful tool for self-empowerment and education, and she is drawn to authors who are brilliant, bookish, and driven to share their knowledge and perspective with readers. In the last decade she has acquired and edited a number of bestselling and award-winning titles, including books by Ryan Holiday, Seth Godin, Annie Duke, Scott Galloway, Jennifer Breheny Wallace, Nir Eyal, Vanessa Van Edwards, Cal Newport, Shane Parrish, Indra Nooyi, Nir Eyal, James Rickards, Katy Milkman, Nick Bilton, and Brad Stulberg.

Niki joined Portfolio in 2011 as a Senior Editor focusing on business, economics, and self-help. In 2021 she was named Editor-In-Chief of Portfolio, and in 2023 she co-founded the Thesis imprint to focus on provocative nonfiction outside of the business space. Prior to Portfolio, Niki spent several years at PublicAffairs where she acquired history, politics, technology, and economics. She started her career in 2006 as an editorial assistant at Basic Books after several years teaching English as a Second Language (ESL) in Spain and Washington, DC.