Sentence: 'As Brent wrote the book , he traveled around the world , interviewing such spiritual and investment luminaries as His Holiness the Dalai Lama , Thich Nhat Hanh , Rabbi Harold Kushner , David Whyte , Nobel Prize winner Dr. Harry Markowitz , Vanguard Funds founder John Bogle , Ram Dass , and Joseph Goldstein .', Argument/Subject 1: 'john bogle', Argument/Subject 2: 'vanguard'
be founder of