Çalık. After working as an executive at an industry-leading investment company, Sümer returned to Aktif Bank in 2015 to assume the role of CEO, and until the end of 2020 he served as the Bank’s CEO and Board Member. As of 2021 Sümer has been working as a Board Member of Çalık Holding, Aktif Bank and Subsidiaries, ALBtelecom, BKT and Yepaş.