 He was an Adjunct Professor of geophysics and space physics 1996 to 2006  at the Niels Bohr Institute of University of Copenhagen and has authored over 140 research articles or books.He lectures worldwide; in 2008 he made a presentation at the U.S. National Institute of Aerospace.From 2004 until 2012 Friis-Christensen was Director of the Danish National Space Center.