I am currently a Research Scientist at Google, working in the Machine Hearing Group on machine learning for speech and audio processing. Before joining Google, I was a Research Scientist at the Johns Hopkins University Human Language Technology Center of Excellence, an Assistant Research Professor in the John Hopkins Department of Electrical and Computer Engineering, and a faculty member of the Center for Language and Speech Processing. My research has explored a wide range of speech and audio processing topics that involve unsupervised/semi-supervised representation learning, speech retrieval, content-based recommendation, latent structure discovery, time series modeling and analysis, and scalable algorithms for big data applications. These days I am focused on inventing new multimedia processing technologies made possible by vast amounts of data. See my personal website or my Google scholar page for a full list of publications.