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In 1830 he succeeded Karl August Weinhold ( 1782-1829 ) as professor of surgery at Halle , afterwards ( 1833 ) , relocating to the University of Bonn as a successor to Philipp Franz von Walther ( 1782-1849 ) .
 organization: Halle; organization: University of Bonn; person: Philipp Franz von Walther
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Halle, University of Bonn, Philipp Franz von Walther 
Answer:
 organization: Halle; organization: University of Bonn; person: Philipp Franz von Walther