Philanthropist Warren Hellman at the 10th annual Hardly Strictly Bluegrass Festival in San Francisco's Golden Gate Park on Sunday.
Photo: Liz Hafalia / The Chronicle
Philanthropist Warren Hellman at the 10th - Media (1 of 85) Hardly Strictly Bluegrass
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Philanthropist Warren Hellman at the 10th annual Hardly Strictly Bluegrass Festival in San Francisco's Golden Gate Park on Sunday.
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