Sokullu's grandparents were Bosnian immigrants. Sokullu left his basketball career after 10 years due to his leg injury. He graduated from Maltepe University with a specialty in Radio TV Programming. While studying at university, he began his modelling career. He took acting lessons from Dolunay Soysert. He also studied in Drama and Acting Departmant of Istanbul Aydin University for one year. But he left.

Birkan started to get noticed that joined as new characters in the popular series including "Kucuk Kadinlar", youth series "Melekler Korusun", crime series "Ucurum". His first popular leading role is Demir (original role, Dan) in Kucuk Sirlar, the Turkish remake of Gossip Girl. His fame gained with hit series "Hayat Sarkisi" and "Masumlar Apartmani". His period series are "Kurt Seyit ve Sura", "Rise of Empires: Ottoman", "Ya Istiklal Ya Ölüm", "Bir Aile Hikayesi", "Fatih". He played in vampire series "Yasamayanlar" with Kerem Bürsin, Elcin Sangu and horror film "Güzelligin Portresi".

IMDb Mini Biography By: yusufpiskin