Field Experience 2009 Co-PI on South Pole firn air experiment 2008-2010 Three 5week summer deployments to NEEM camp to perform microbiology. 2006 PI for multi US institution NSF project to sample firn air from West Antarctic Ice core deep drilling site (WAIS) 2003 PI on 2 month deep field trip to Mt. Moulton 1997 Expedition to summit (6,250masl) of El Navado Sajama, Bolivia to drill ice cores. Led by Lonnie Thompson. . 1989-95 Three summer trips to various Antarctic stations (Vostok, Pole). Co-chief scientist on one expedition to Vostok (92/93) 1989-92 Three summer trips to Summit, Greenland (GISP II)