Dirk Dujesiefken was a research fellow for the Chair for Wood Biology from 1980 to 1991 and has been head of the Institute of Arboriculture in Hamburg since 1991. He teaches at the University of Applied Science (HAWK) in Göttingen, Germany, at the Swedish University of Agricultural Science (SLU) in Alnarp, Sweden, and at the University of Natural Resources and Life Sciences (BOKU) in Vienna, Austria.