Alasya was born in Istanbul. After studying at Robert College, he joined MTTB Theatre as an amateur actor. For a short time, he worked at Arena, Gen-Ar and Ulvi Uraz Theatre. With some friends, he founded the Devekuşu Kabare Theatre (Ostrich Cabaret Theatre).
From 1973, he started acting in films and gained fame as a comedian paired with Metin Akpınar like Salak Milyoner, Beş Milyoncuk Borç Verir misin, Köyden İndim Şehire, Güler misin Ağlar mısın, Nerden Çıktı Bu Velet, Nereye Bakıyor Bu Adamlar, Hasip ile Nasip and Güle Güle. In 1977, he also took up directing and went on to direct films such as Aslan Bacanak, Sivri Akıllılar, Caferin Çilesi, Petrol Kralları, Doktor, Köşe Kapmaca, Vay Başımıza Gelenler and Elveda Dostum.