Sabrina J. Mielke is a final-year PhD student at the Johns Hopkins University, currently researching open-vocabulary language modeling for vocabulary selection and unit discovery. While her pre-PhD work focused on formal language theory applied to parsing and translation, during her PhD she published on morphology, fair language model comparison, stochastic romanization (at Google AI), metacognition and calibration for chatbots (at Facebook AI Research), and tokenization (at HuggingFace).