Karmela Padavic-Callaghan is a scientist, a journalist, and an educator based in New York City. A staff writer at New Scientist, they report on physics, materials science, and quantum technology. They hold a PhD in theoretical condensed matter physics and atomic, molecular and optical physics from the University of Illinois Urbana-Champaign. Their popular science writing has been featured in such publications as Wired, Scientific American, Aeon, Slate, and MIT Technology Review. They are the author of Entangled States.