[2] Ergün debuted in cinema with director Yilmaz Güney in 1974.

Ergün played in many important movies, including Maden, Kuma, Hamam and Kalbin zamanı.

In 2006, he starred in the popular television series Yaprak Dökümü as Ali Rıza Bey.

[3] Ergün was honored with "Best Actor" award in the theater and cinema, including from Golden Orange Film Festival in 1995 for "Böcek" and from Adana Golden Boll Film Festival in 1995 for "Böcek" and again in 1996 for "Mum Kokulu Kadınlar".

[4][5] He received an honorary lifelong achievement award in 2007 from Golden Orange Film Festival.