Per Jensen is professor of theoretical chemistry at the University of Wuppertal, Germany. His research interests lie in the border area between high-resolution molecular spectroscopy and quantum chemistry. He develops and applies methods for the accurate simulation of rotation-vibration spectra of small molecules, mostly of astrochemical and/or atmospheric interest. He is particularly interested in the application of molecular symmetry to facilitate the solution of nuclear-motion problems. Recently, he has worked extensively on interactions between electronic states (the Renner effect), the characterization of rovibrational energy clusters at high rotational excitation, and extremely flexible (structureless) molecules. He is author or co-author of about 200 publications.