Question: Find the public speaker who spoke on the topic of Energy development, who does he admire?
Answer(s):
answer: Saul Alinsky
answer: Reinhold Niebuhr
answer: Nipsey Russell

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:event.public_speaker.speeches_or_presentations ?k .
?k ns:event.speech_or_presentation.speech_topic ns:m.02mg6f . 
?c ns:influence.influence_node.influenced_by ?x .
}