Carl Johannes With (11 December 1877 – 16 June 1923) was a Danish medical doctor and arachnologist, specialising in pseudoscorpions and mites.[1] [2]
With was born in Lemvig to Nicolai Rasmus With and his wife Rasmine Sophie Dorothea With, but was orphaned by the age of five.[2] With married Inge Kiørboe on 1 July 1909, and together they had three children.[2] With died in 1923 in Skibstrup, in the parish of Hellebæk (Helsingør Municipality),[3] while still working on a dissertation on lupus.[2]
After studying at the University of Oxford in 1896, With studied natural history and geography, and in 1904, undertook a research trip to England and in particular, the collections of the British Museum. In 1905, he won the (Schibbye Prize) for his work on Opilioacariformes.[2]
With was not confident that zoology could provide a secure future, so he studied medicine, including time at the French: [[Pasteur Institute|Institut Pasteur]] in Paris. He took part in the Franco–Danish leprosy expedition to the Danish West Indies in 1909, graduated in 1911, and then started to work as a dermatologist at the University Hospital and Municipal Hospital in Copenhagen.[2]