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: Gavin Newsom and 2015 NBA Champion Golden State Warriors Center, Festus Ezeli, joined Nasdaq officials, CEO Bob Greifeld and Vice Chairman Bruce Aust, in ringing the Nasdaq Closing Bell remotely from San Francisco in celebration of the launch of the Nasdaq Entrepreneurial Center.
user
headquarters_location: Golden State Warriors, San Francisco
assistant