Arjun G. Yodh is the James M. Skinner Professor of Science at the University of Pennsylvania. Physics & Astronomy is his home department, and he has a secondary appointment in the Department of Radiation Oncology in the Medical School . He is a member of several interdisciplinary institutes at PENN including, the Laboratory for Research on the Structure of Matter (LRSM) , the Institute of Medicine and Engineering (IME), the Bioengineering Graduate Group, and the Abramson Cancer Center. Yodh received his B.Sc. from Cornell University , and his Ph.D. from Harvard University . He joined the University of Pennsylvania faculty in 1988, following a two-year postdoctoral fellowship at AT&T Bell Laboratories. His current interests span fundamental and applied questions in condensed matter physics, medical and biophysics, and the optical sciences. Areas of ongoing research include: soft materials, complex fluids and networks, carbon nanotubes, laser spectroscopy, optical microsopy & micromanipulation, biomedical optics, functional imaging and spectroscopy of living tissues, photodynamic therapy and nonlinear optics.