Fritz Johann Hansgirg
Fritz Johann Hansgirg ( 18911949 ) was an Austrian electrochemist and metallurgist who in 1928 invented the carbothermic magnesium reduction process ( magnesium , like calcium , can be used to reduce uranium oxide to pure uranium metal for use in nuclear weapons ) , similar to the Pidgeon process . 
<triplet> Fritz Johann Hansgirg <subj> electrochemist <obj> field of work