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Isabel O’Brien is an investigative journalist based in New York, reporting on how money and power shape infrastructure, climate, and private markets. 

Her work has appeared in The Guardian, Investopedia, and other outlets, where she covers a variety of topics including climate finance, emissions disclosures, and regulatory blind spots. Previously, she was the Editor in Chief of Portco News, an independent publication covering how private equity runs its portfolio companies, as well as a reporter at Infrastructure Investor (PEI Group) covering North and Latin American private infrastructure.

Isabel’s work has earned multiple honors, including two Aviva Investors Sustainability Media Awards (2022, 2023), a screenwriting award at the New York Script Awards, and a semifinalist spot at the 2024–25 Athena Film Festival Writers Lab. In 2025 she was named an "Emerging Leader" in writing and journalism by Marquis Who's Who.

She is also the co-founder and president of The Association of Women in Business Journalism, an international initiative supporting non-male journalists on her beat.

Isabel is a graduate of the Dual BA between Columbia University and Sciences Po Paris. She studied economics, politics, and creative writing.