text: Before moving to California he was a visiting senior research scientist in the Department of Micro- and Nanotechnology at the Technical University of Denmark (DTU Nanotech) in Kgs. Lyngby, Denmark,  a visiting research professor at Aalto University School of Science and Technology in the Department of Applied Physics, a visiting senior research scientist in the Department of Micro- and Nanotechnology at the Technical University of Denmark (DTU Nanotech) in Kgs. Lyngby, Denmark; a visiting research professor at Kyushu University in Kasuga, Fukuoka, Japan; a visiting FAPESP Professor of Molecular Biophysics at the University do Vale do Paraíba, UniVap, in São Jose dos Campos, São Paulo, Brazil in the Laboratory of Biomedical Vibrational Spectroscopy, LEVB; a visiting senior research scientist at the Bremen Center for Computational Material Science (BCCMS) at the University of Bremen in Bremen, Germany; a visiting professor of biophysics at the Nanochemistry Research Institute (NRI) at Curtin University of Technology in Perth, WA, Australia; a visiting scholar at the German Cancer Research Center (DKFZ) in Heidelberg, Germany; a visiting professor of biophysics in the Laboratory of Physics at Helsinki University of Technology, now Aalto University in Otaniemi, Finland; and an associate professor of biophysics at the Technical University of Denmark.