What is the relationship between Walkman and Sony in the context of the input sentence. Choose an answer from: 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: Indeed, in the year after the digital Walkman disaster, Stringer, the British man running the Sony American operations, threw himself into the task of fighting the silos, with sometimes comical results.
user
manufacturer
assistant