Helge Backlund
Helge Götrik Backlund or Oleg Oskarovich Baklund in the Russian form (September 3, 1878 – January 29, 1958) was a Swedish geologist and mineralogist. He grew up and worked in the Russian Empire before moving to become a professor at the University of Uppsala. He had a special interest in the formation of granites and gneiss.