SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Joseph_Stiglitz> <http://dbpedia.org/property/president> ?uri }
which president was served by Joseph Stiglitz?
SELECT DISTINCT ?s WHERE { resource:Joseph_Stiglitz property:president ?s }
Bill Clinton
The president served by Joseph Stiglitz is [Bill Clinton].
[Bill Clinton] was served by Joseph Stiglitz.
The president served by him is [Bill Clinton].
The president he served is [Bill Clinton].