Known for his versatility across multiple genres, he has had a career in the Sri Lankan film industry spanning over four decades.
His breakthrough role came with Ganga Addara, directed by Sumitra Peries, which marked a turning point in his acting career.
He later gained widespread recognition for his portrayal of Aravinda in Viragaya, a performance that earned him Best Actor awards at every major film festival in Sri Lanka.
Gunatilake has appeared in several notable films, including Kedapatha, Palama Yata, Doorkada Marawa, and Rajya Sevaya Pinisai.
His film credits include Koti Waligaya, Dinuma, Raja Wedakarayo, Nommara 17, Obatai Priye Adare, and Inspector Geetha.