Deletion of Bernhard Steffen (computer scientist)

Comment: per the multiple passes of  criteria demonstrated by Randykitty. In addition, although I'm not entirely sure how the German system works in this regard, his chair seems to be one step higher than a normal full professor position (it's a position he earned four years after becoming full professor but I can't tell whether that was a lateral move or step up) so may pass #C5
Stance: keep
Cited policy: Wikipedia:Notability (WP:PROF||WP:PROF)