Gelenbevi Ismail Efendi

Ismail Gelenbevi was an Ottoman Turkish mathematician, Hanafi Maturidi theologian, logician, philosopher and Professor of Geometry at the Naval College in Constantinople, born in 1730 in the town of Gelenbe near Manisa and dead in 1790 or 1791. He studied in Constantinople, where he rose through the Ottoman examination system to the rank of professor at the age of thirty-three. At the request of the Grand Vizier Halil Hamit Pasha and of the Fleet Admiral Cezayirli Hasan Pasha, he was appointed to a professorship of mathematics at the new Naval College in Kasimpasa, on the Golden Horn. Sultan Selim III rewarded him for his very accurate ballistic computations. He published some thirty-five scientific treatises, including a monograph on chess, and is credited with introducing logarithms in Turkey.