Channa joined Geoffrey Bawa’s architecture practice in 1991 and was the last partner of the firm. In 1998, he established MICD Associates, where he is a principal, in partnership with Murad Ismail. Channa was the Chairperson of the Galle Heritage Foundation and has worked on a number of architectural, conservation and curatorial projects, including the Corridors of Power Installation which was exhibited at the most recent Dhaka Art Summit in 2018. Channa authored and edited Sri Lanka Style (2005) has written for and edited a number of publications including A+U and Sri Lanka Institute of Architects’ Journal. Channa is the chairperson of the Geoffrey Bawa and Lunuganga Trusts.