RRD Instructors Hanshi Serdar Kaleli RRD Umitköy Dojo Hanshi Berk Karadeniz RRD Black Sea Dojo Kyoshi Nihal Lindberg RRD International Renshi Doğan Memişoğlu RRD Hacettepe University Dojo Renshi Ayber Eray Algüner RRD Hacettepe University Dojo Senpai Yunus Emre RRD Black Sea Dojo