page_title: Knud Jessen
hierarchical_section_title: Knud Jessen
caption_attribution_description: English: portrait of Knud Jessen, Danish botanist
context_page_description: Knud Jessen was a Danish botanist and quaternary geologist.
  He was state geologist 1917–1931. In 1931, he succeeded C.H. Ostenfeld as professor of botany at the University of Copenhagen and director of the Copenhagen Botanical Garden, a position he held until his retirement in 1955. His scientific works mainly concern vegetation history during the Eemian interglacial, the late glacial period of the Wisconsin glaciation and in the Holocene investigated using pollen analysis.
  Jessen had come into contact with the Irish naturalist Robert Lloyd Praeger and made field-work on the quaternary geology of Ireland during 1934-1935. Together with his assistant, Frank Mitchell, he was able to describe both the post-glacial vegetation development of Ireland and that of the Eemian interglacial, with the presence in Ireland of such plants as Rhododendron ponticum, Abies alba, Erica scoparia and Buxus sempervirens.
  Jessen was acknowledged by honorary doctorates at the University of Cambridge and University of Dublin. He was a member of the Royal Danish Academy of Sciences and Letters and served on the board of directors of the Carlsberg Foundation.
context_section_description: Knud Jessen (29 November 1884 – 14 April 1971) was a Danish botanist and quaternary geologist.
  He was state geologist 1917–1931. In 1931, he succeeded C.H. Ostenfeld as professor of botany at the University of Copenhagen and director of the Copenhagen Botanical Garden, a position he held until his retirement in 1955. His scientific works mainly concern vegetation history during the Eemian interglacial, the late glacial period of the Wisconsin glaciation and in the Holocene investigated using pollen analysis.
  Jessen had come into contact with the Irish naturalist Robert Lloyd Praeger and made field-work on the quaternary geology of Ireland during 1934-1935. Together with his assistant, Frank Mitchell, he was able to describe both the post-glacial vegetation development of Ireland and that of the Eemian interglacial, with the presence in Ireland of such plants as Rhododendron ponticum, Abies alba, Erica scoparia and Buxus sempervirens.
  Jessen was acknowledged by honorary doctorates at the University of Cambridge and University of Dublin. He was a member of the Royal Danish Academy of Sciences and Letters and served on the board of directors of the Carlsberg Foundation. Jessen also lived in the Botanical Gardens in his later life.
caption: Knud Jessen
exif: {"Image ImageWidth": "374", "Image ImageLength": "506", "Image BitsPerSample": "8", "Image Compression": "LZW", "Image PhotometricInterpretation": "1", "Image Orientation": "Horizontal (normal)", "Image SamplesPerPixel": "1", "Image XResolution": "600", "Image YResolution": "600", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop Elements 11.0 Windows", "Image DateTime": "2015:05:30 21:51:59", "Image ExifOffset": "244", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "394", "Thumbnail JPEGInterchangeFormatLength": "7923", "EXIF ExifVersion": "0221", "EXIF ColorSpace": "Uncalibrated", "EXIF ExifImageWidth": "374", "EXIF ExifImageLength": "506"}