Question: At what colleges, founded prior to 1855, did Albert Einstein teach?
Answer(s):
answer: Leiden University
answer: Charles University in Prague
answer: University of Zurich

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.0jcx)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.0jcx ns:people.person.employment_history ?y .
?y ns:business.employment_tenure.company ?x .
?x ns:common.topic.notable_types ns:m.01y2hnl .
?x ns:organization.organization.date_founded ?num .
FILTER (?num < "1855"^^xsd:dateTime) . 
}