frischknecht went to work at exxonmobil research & engineering co. as a postdoctoral fellow. she stayed there from 1998 until 2000 and worked on polymer rheology with scott milner, who is now a professor of physics at pennsylvania state university. they investigated the dynamics of polymer melts made star-shaped polymers, which are a branched polymer in which several chains are linked together via a central core. they also studied diffusion of linear polymers.