Q: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Sentence: 'The current president and CEO of Microsoft Corp. Microsoft founder Bill Gates asked his Harvard pal Ballmer to join his new company in 1980 .', Argument/Subject 1: 'bill gate', Argument/Subject 2: 'microsoft'
A:
be founder of