Colleen de Bellefonds is a Paris-based science journalist and editor with nearly two decades of experience.
My reporting and writing has appeared online and in print at in more than 20 outlets, including MIT Tech Review, US News & World Report, PopSugar, Cosmo, SELF, Well + Good, BabyCenter, The Bump, What To Expect, Men’s Health, Women’s Health, Healthline, Vice, Everyday Health, Prevention, WebMD, and more.
Corporate clients have included the American College of Obstetricians and Gynecologists, Weight Watchers (WW), Oscar Healthcare, Freenome, Vitamin Shoppe, L’Oreal and Clarins, among others.
I received my master’s in science writing from Johns Hopkins University in 2025.
Before moving to France in 2016, I was the senior editor at the #1 pregnancy and parenting brand What To Expect. While on staff, I recruited and coached a stable of more than a dozen regular freelance health writers and managed the calendar and budget. I assigned all health news as well as all core evergreen content, from week-by-week pregnancy guides to content on fitness, nutrition, labor and more. Working cross-functionally with tech and design, my team modernized and personalized the What To Expect app, which remains the top pregnancy and parenting app on iTunes and Android.
I graduated magna cum laude from the University of Southern California’s Annenberg School of Journalism in 2006 and began my career at a strategic communications firm. My pitches helped clients secure coverage in national outlets such as the Associated Press, the BBC and The Wall Street Journal. Later, as a health editor with the content marketing company Studio One Networks, I conceptualized editorially-driven websites for clients including Similac, Oral B, Puffs and Pampers. In this role, I managed a team of freelancers while working with brands to create sponsored editorial packages.