Answer
Ekrem İmamoğlu took office on June 27, 2019, after a controversial mayoral election in Istanbul. He defeated the incumbent mayor, Binali Yıldırım, in a rerun election called after the initial results were annulled due to irregularities. İmamoğlu's win marked a significant moment in Turkish politics, as it ended the ruling Justice and Development Party's 25-year hold on Istanbul, Turkey's largest city.