Gordon Thomas Whyburn
of Texas , with the aid of a Guggenheim fellowship Whyburn spent the academic year 1929/1930 in Vienna with Hans Hahn and in Warsaw with Kuratowski and Sierpinski . 
<triplet> Vienna <subj> Warsaw <obj> twinned administrative body <triplet> Hans Hahn <subj> Vienna <obj> work location <triplet> Warsaw <subj> Vienna <obj> twinned administrative body