There, she collaborated with her PhD advisor from Columbia (Langmuir) to work on her most cited publication, The chemical composition of subducting sediment and its consequences for the crust and mantle (see below). From 1999 to 2007, Plank was a professor of Earth Sciences at Boston University (Associate Professor from 1999 to 2005 and Professor from 2005 to 2007). Since 2008, Plank has been at Columbia University in New York, New York, appointed as an Arthur D. Storke Memorial Professor in their Earth and Environmental Science Department.