He joined ABK Architects in 1998, becoming a director in 2001. John was the design leader on a range of buildings recognised for the quality of their design and execution including Kilmallock Library, Local Area Office and Courthouse, Cork City Civic Offices, and Offaly Civic Offices which received numerous awards including RIAI Best Public Building Award, RIAI Best Sustainable Building and RIBA European Award. He is a senior lecturer in the School of Architecture, University College Dublin as well as a visiting critic to a number of architecture schools in Ireland, the U.K. and Spain.