Dr. Sisik was born in Afyonkarahisar. He went to primary school in Afyonkarahisar and high school in Eskişehir. In 2001, he started studying at Ege University Faculty of Medicine. Sisik graduated from the Faculty of Medicine in 2007 and received general surgery education at Ümraniye Education and Research Hospital between 2007-2012. Between 2013-2014, he served as a General Surgery Specialist at Bingol State Hospital.
In 2014, he returned to İstanbul Ümraniye Education and Research Hospital as General Surgery Specialist.
Between 2014-2020, he worked specifically at Umraniye Training and Research Hospital on bariatric surgery and colorectal surgery. He specialized in advanced laparoscopic surgery.
In 2018 and 2019, he had the opportunity to work with Prof. Bruno Dillemans in Belgium on bariatric surgery.
He performed around 1500 bariatric surgical procedures.
In 2019, he was awarded the title of Associate Professor by the Inter-University Committee.
He has more than 50 scientific articles published in international and national journals and about 100 papers presented in international and national congresses.
Sisik is also one of the founders of the journal Archieves of Clinical and Experimental Medicine and is the chief editor of the year 2020.
He is married and has two children. His hobbies include playing football and hiking.