Hamblin is a preventive medicine physician, staff writer at The Atlantic, and lecturer at Yale School of Public Health. He is the author of If Our Bodies Could Talk (Doubleday, 2016) and the forthcoming Clean (Riverhead, 2020). He hosted the video series If Our Bodies Could Talk, for which he was a finalist in the Webby awards for Best Web Personality. He is a past Yale University Poynter Fellow in journalism, and he has lectured at Harvard Medical School, Wharton Business School, Columbia Mailman School of Public Health, and SXSW, among others.

His writing and videos have been featured in The New York Times, Politico, NPR, The Guardian, Elle, Mother Jones, The Washington Post, The Awl, The Los Angeles Times, and Marketplace, among others. Time named him among the 140 people to follow on Twitter, Greatist named him among the most influential people in health media, and BuzzFeed called him "the most delightful MD ever," though he is not as delightful as William Carlos Williams.

After medical school at Indiana University, he did three years of residency before joining The Atlantic to develop a health section and write. He later completed a residency in general preventive medicine and public health. More on that at Columbia Journalism Review, The Washington Post, Journal of the American College of Radiology, and Politico.

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