Gezienus (or Gesinus) ten Doesschate (11 August 1885 in Zwolle – 9 March 1965 in Utrecht) was a Dutch ophthalmologist, amateur painter and historian.Gezienus ten Doesschate, Schilderkunst en optiek 1925
He was active as an amateur painter in Utrecht under the pseudonym Thomas Denier.Theo van Doesburg, Jo-Anne Birnie Danzker, Carel Blotkamp (2000) Theo van Doesburg, Maler-Architekt. p. 178 He had good contacts with the cultural elite of Utrecht around the First World War and was good friends with the painters Janus de Winter and .P. M. J. Jacobs (1993) Beeldend Nederland: biografisch handboek. Vol 1. p. 288 In 1916 he was briefly a member of de Anderen, a Dutch artists' group that included Theo van Doesburg, but dropped out in support of de Winter, another artists group.
At the end of his life he contributed to a number of medical-historical books concerning the University of Utrecht.List of publications at National Library of the Netherlands
His son was Jurriaan ten Doesschate (1912–1977), ophthalmologist and medical scientist
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