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In 1995 I received my PhD from the Department of Physics and Astronomy, Utrecht University, Netherlands. From 1995-1997, I worked an NRC postdoctoral fellow at NASA Johnson Space Center, Houston. Since 1997, I have worked in the Cosmochemistry group at the Space Sciences Lab analyzing cosmic-ray produced (cosmogenic) radionuclides in meteorites, lunar samples, asteroid samples, terrestrial rocks and ice cores. I have worked on the West Antarctic Ice Sheet (WAIS) Divide ice core project that used a 3400 m deep ice core to obtain detailed information on rapid climate change in the past 68,000 years. The high-resolution 10Be measurements that we made in this ice core provide information on temporal variations in the cosmic-ray flux due to changes in geomagnetic field strength, solar activity, and the occurrence of large solar proton events. The measurements of cosmogenic nuclides in extraterrestrial samples, which are mostly done by accelerator mass spectrometry (AMS), are used to study dynamical processes in the asteroid belt, and on the lunar surface. My most recent work has involved cosmogenic nuclide measurements on samples from an Apollo 17 core 73001/02 as part of NASA’s Apollo Next Generation Sample Analysis program and on samples from asteroid (101955) Bennu that were returned by NASA’s OSIRIS-REx mission.
