de Siún Architects provides high-end design services to the private and public sectors, including several Approved Housing Bodies, and private clients. dSA has been featured in a number of publications including the Irish Times, the Sunday Times and the Sunday Business Post as well as online platforms such as dezeen and designboom, and has received awards for their work from the RIAI.de Siún Architects work is regularly featured in the Architectural Foundation's Open House.

Director and founding Partner with de Siún Scullion Architects. Mícheál de Siún and Declan Scullion collaborated successfully for 2 years before continuing as separate practices. DESARC Ltd, the company trading as de Siún Scullion, began trading as de Siún Architects in October 2016, while Declan Scullion established a new practice, Scullion Architects.

In 2013 Mícheál de Siún incorporated DESARC Ltd, providing professional architectural services to the private and public sectors, specialising in public procurement frameworks, healthcare design, as well as high-end design and residential development. This company began trading as de Siún Scullion Architects in June 2014 as a collaboration between Mícheál de Siún and Declan Scullion, winning several design awards and becoming widely published.

Associate Director, Senior Project Architect

Mícheál joined Murray Ó Laoire Architects in 1995 on his return from Germany. Initially joining as an Architectural Technologist, Mícheál maintained his strong relationship with both the firm and with Seán Ó Laoire, who acted as his mentor during Mícheál's return to Architectural education in the Glasgow School of Art. On graduation from Glasgow, Mícheál returned to full-time employment with Murray Ó Laoire Architects, acting as project Architect on a number of large-scale residential and social developments.