Deletion of Ulrich Hagen

Comment: Seems to pass  criteria 1 and 2 as being well-recognized and imporant in his field. The article needs cleanup, as it's a little too close to the reference listed at the bottom (Radiat Environ Biophys (2000) 39:1), a one page tribute to him in a journal
Stance: keep
Cited policy: Wikipedia:Notability (WP:PROF)