Joyce McLaughlin is the Ford Foundation Professor of Mathematics at Rensselaer Polytechnic Institute. She obtained her Ph.D. from the University of California, Riverside. She has been a visiting professor at Cornell University, Australian National University, the University of California, Berkeley, and New York University’s Courant Institute. She presented her work on inverse nodal problems in an invited talk at the International Congress of Mathematicians in Zürich, Switzerland in 1994. She works on inverse problems in acoustics and vibrating systems and on wave propagation. Address: Department of Mathematical Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180. Internet: mclauj@rpi.edu.