He was appointed as the 22nd Mahanayake Thera of the Asgiriya Chapter on 7 April 2016, by the Karaka Sangha Sabha of Asgiriya chapter, after the demise of Galagama Sri Aththadassi Mahanayaka Thera.

Gnanarathana thero is known for voicing his right-wing political proclivities in public.

In 2017, he issued a statement condoning the views of the hard-line nationalist monk Galagoda Aththe Gnanasara.

[7][8] The ensuing public backlash[9] forced Gnanarathana thero to deny his previous statements.

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