WORKS OFFICE is a full service Architecture Practice licensed in Ontario, New York State, and the State of Utah (inactive).
Brian personally partners with the Client from initial conception through Final Completion for each Work in which we are engaged.
The basis of our service is in the delivery of Architecture. That requires a relationship built with the Client, and further with the Contractors and Trades. The Work is typically viewed as phases of service. Among them are these:

  • Predesign and Zoning Research

  • Preliminary Design and/or Master Planning

  • Design Development

  • Construction Documentation, including the coordination of all Subconsultants

  • Municipal Filings and Approvals

  • Tendering and Negotiation

  • Contract Administration

Architecture has the capacity to exist at any scale. A single family house, an apartment, a municipal building, a development, a shed, or a piece of furniture all carry the same underlying principles, despite the inherent variation in complexity and logistics. No matter the size or scope, the Office is diligent in its role as an asset to the Client. Behind the anonymously titled Work is a myriad of very specific relationships and commitment to the people for whom we make Architecture.

The objectives of WORKS OFFICE are to seek out the potential that’s latent in each place, and in each client. That potential is in all cases premised on the search for what is often verbally undefined, but no less real, and no less valuable. It’s the search for the inherent beauty of place. Our efforts begin when that place is only an idea, and they carry through to the time that idea is inhabited. To that end, the Office is committed to fostering relationships, not only with the Client, but with General Contractors and trades, that work towards the commonly held objectives to construct the Architecture that was conceived. The in-between is a process that’s permeated with decision making, and with momentum. Maintaining a critical eye on that process, both for and with a Client, is in the fabric of our intentions.

With an interest in having our work built anywhere, we currently reach from Toronto and New York to Thunder Bay, San Diego, and Costa Rica.
The Office may be in Toronto, but the Work is where the Work is.

For any questions, please email, or use this form, which will send a message directly to Brian O’Brian.


Brian was born and raised in the West and Midwest of the United States.
He attended the New Jersey School of Architecture at NJIT in Newark, NJ, graduating with multiple awards.
On graduating in 2000, he fulfilled apprenticeship working requirements with numerous offices in New York City prior to taking the Architect Registration Examinations.
He co-founded Omas Workshop in 2001, a practice that gave first opportunities for built work. On receiving a Licence to practice Architecture by the State of New York in 2005, he went on to co-found O’Brian Muehleisen Architecture Studio in New York City.
Over the course of 17 years, the practice operated in varying iterations, from Omas Workshop to OMAS:WORKS, expanding to Toronto with Brian’s relocation in 2010.
In 2017, Brian became a dual Citizen of Canada and the United States.
Brian continues his dedication to the Work, and to the clients who make that work happen, with his renamed practice, WORKS OFFICE of Brian O’Brian Architect.

  • Licensed Architect with the Ontario Association of Architects

  • Licensed Architect in the State of New York

  • Licensed Architect in the State of Utah (inactive)

  • Member of the American Institute of Architects

  • Member of the Toronto Society of Architects

  • Member of, and certified by, the National Council of Architectural Registration Boards and the Canadian Architectural Certification Board

  • Sessional Lecturer, instructing Second Year Undergraduate Students, at the John H. Daniels Faculty of Architecture, Landscape, and Design at the University of Toronto