Adjunct Professor at the Department of Earth and Environmental Sciences of Columbia University eesc.columbia.edu

Head of Cosmogenic Dating Group at Lamont www.ldeo.columbia.edu/res/pi/tcn/LDEO_Cosmogenic_Nuclide_Lab/About_Us.html

Lamont Research Professor www.ldeo.columbia.edu/res/pi/tcn/cosmo_group/About_Us.html

Part of the Columbia Earth Institute www.earthinstitute.columbia.edu