Born in Istanbul, Kemaleddin Bey (1870-1927) was, with Vedat Tek, a major exponent of Birinici Ulusal Mimarlık (First National Architecture). Having studied under August Jasmund, he went on to work with Vedat Tek on developing a more pared-down style of architecture that still incorporated Selçuk and Ottoman motifs. At times he also incorporated elements taken from Art Nouveau into his work.

His portrait appears on the reverse of the TL20 banknote.

His works include: 

Bebek Cami, İstanbul 

Bostancı Cami, İstanbul 

Çamlıca Girls’ High School, İstanbul 

Edirne Railway Station, Karaağac

First and Fourth Vakıf Hans, İstanbul 

Gazi Osman Paşa tomb, İstanbul 

Reşadiye Primary School, Eyüp, İstanbul 

Sultan Mehmed Reşad’s tomb, İstanbul 

Tayyare (Harikzedegan) Apartments, İstanbul 

Yeşilköy Cami, İstanbul