PortraitMorgan Stone GretherApril 30, 2014portrait, Turkey, Sezgi Olgaç, singer Sezgi Olgaç Istanbul-based singer and photographer Sezgi Olgaç posed for me April 2014. PortraitMorgan Stone GretherApril 30, 2014portrait, Turkey, Sezgi Olgaç, singer