Miller was previously a world and national security reporter for POLITICO, a world correspondent for BuzzFeed News and the Ukraine correspondent for Radio Free Europe/Radio Liberty in Kyiv. His work has also been published with The Times, The Guardian, The Atlantic, CNN, Vice News, the Telegraph, the Independent and other news outlets. As an editor and reporter at Ukraine's Kyiv Post newspaper in 2014, Miller helped lead the team that won the Missouri Honor Medal Winner for Distinguished Service in Journalism for coverage of the Euromaidan Revolution, Russia's annexation of Crimea and its first invasion of eastern Ukraine.
Miller began his journalism career in Portland, Oregon, in 2004. He is now based in Kyiv.