Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.
Text: Dimitrios started and led the theatrical distribution analytics team in his previous role as VP, International Research at Universal Pictures International, whereas Matthew led the first data science group at NBCUniversal International and holds invited research positions at Goethe Universitat in Frankfurt and with the Masters of Data Science program at the Barcelona Graduate School of Economics.
user
subsidiary: NBCUniversal, Universal Pictures
assistant