Hartmut Roskos is Professor of Physics at Johann Wolfgang Goethe-University, Frankfurt am Main, Germany. He studied Physics at the Technical Universities of Karlsruhe and Munich, receiving the PhD degree from the latter in 1989 for a thesis on femtosecond spectroscopy in solid-state physics. He then worked for two-and-a-half years at AT&T Bell Laboratories, Holmdel, USA. At that time, THz phenomena became a new focus of his research. He later started a research group at the Institute of Semiconductor Electronics of RWTH Aachen. After receiving the Habilitation degree with a thesis on Coherent Phenomena in Solid-State Physics Investigated by THz Spectroscopy, he joined Goethe-University in 1997 as a Full Professor. Central themes of his group's research are THz physics and photonics, and the time-resolved optical spectroscopy of inorganic semiconductors and organic compounds. In 2005, he spent a sabbatical at the University of California at Santa Barbara working towards a Bloch-gain THz laser. In 2009, OC Oerlikon AG awarded his group a 5-year endowed professorship for Terahertz Photonics (a position now taken by Prof. Viktor Krozer). He spent the winter semester 2009/2010 as an Invited Guest Professor at Osaka University’s Institute of Laser Engineering.