Laurence Yeung is currently a researcher at UCLA in the Department of Earth, Planetary, and Space Sciences. He studies how carbon, oxygen, and nitrogen are distributed in the environment, using their stable isotopes as tags to track how they move about the Earth system (more gory details are available on his webpage). You can also find him on Facebook or Twitter, where you can ask him about his experiences working on science communication projects with PHD TV and the Board on Life Sciences at the National Academy of Sciences as a Mirzayan Science & Technology Policy Fellow.