Skip to content

Guida Moseley Brown Architects is an architectural, interior design, and urban design firm carrying out an international practice from Australia’s national capital.

The firm has extensive experience in major public buildings; educational and research facilities; large-scale residential developments; a range of commercial and corporate projects; and urban design and master planning.

We aspire to create environments that make possible a better life for users, visitors, and for the wider public, and in every case seek to attain design excellence and work in the spirit of art.

Central to our design approach is the understanding and appreciation of place. We aim to respond to a variety of environmental, cultural, social, and historical factors in order to discover an independent and unique expression in each project. It is our belief that a comprehensive and sensitive engagement with the sense of place leads to successful, aesthetically durable and intelligent design solutions.


Guida Moseley Brown Architects has evolved over the past 30 years from the core group of professionals who worked together on the design and documentation of Australia’s new Parliament House at Mitchell/Giurgola & Thorp Architects (MGT).

Subsequent to that significant project, the group has further developed a strong collaborative working method over numerous projects of a broad range of type and scale for government, institutional, commercial, and private clients throughout Australia and overseas.

The firm maintains a staff of between twenty and thirty people, allowing both active involvement by the partners and associates in every undertaking and the capacity to manage output to meet the demands of projects varying in scale from large to small. In turn, the balance of experienced people and moderate size of the practice has created an environment that fosters and promotes professional development and transfer of skills and understanding across the firm.

Guida Moseley Brown Architects has also established a successful method of engaging and working in association where appropriate with other architectural practices and a range of relevant professional disciplines in order to achieve the best possible outcome for clients.

Harold Guida LFRAIA AIA - Partner


Harold Guida has over fifty years of international experience on wide-ranging architectural, interior design, and urban design projects undertaken in the US, Australia, South-East Asia, and China. As a senior partner, he provides overall design leadership for all projects undertaken by Guida Moseley Brown Architects.

Initially a partner of Mitchell/Giurgola Architects in the United States, Mr Guida relocated to Canberra with Mitchell/Giurgola & Thorp Architects in 1981 as Partner-in-Charge of Design Co-ordination for Australia’s new Parliament House, for the project’s eight year duration.

Since the completion of the Parliament House project in 1988, Mr Guida has led multi-disciplinary teams on numerous award-winning projects ranging from office interiors and private houses to school, university and civic buildings, large residential and mixed-use urban buildings, as well as public master plans and urban design proposals for education, government, private, and commercial clients. Many of the architectural projects are conceived in urban design terms due to their mixed-use components and their close and sensitive integrations into the fabric of city form. He has provided urban design and master planning consultancy services to universities, government, and private clients in Canberra, Sydney, Singapore, Putrajaya in Malaysia, Pusan in South Korea, and Suzhou and Chongqing in China.

With respect to Mr Guida’s broader professional contributions, from 1974 to 1981 he was an Adjunct Professor on the Faculty of Architecture at Temple University and in 1988/89, Visiting Professor at the Department of Architecture at California State Polytechnic University.  He has served on numerous juries, including the ACT Chapter and National Awards Juries of the Royal Australian Institute of Architects. He has lectured widely and participated in conferences on design, most recently as an invited speaker at EduBuild Asia, Singapore 2011.

Mr Guida served as a founding Council Member of DesignSingapore, and Adviser to Old Parliament House, Singapore from 2003-2005. He received the Distinguished Achievement Award (Medal) from the College of Architecture and Environmental Design at Arizona State University in 1985, and in May 2007 was awarded an Honorary Doctorate by the University of the Sunshine Coast. In 2009 Mr Guida was elevated to Life Fellow of the Royal Australian Institute of Architects.

Works by Guida Moseley Brown Architects under the design leadership of Mr Guida have received numerous local, national, and international awards, and have been published widely in Australia and Asia.


Bachelor of Architecture - Arizona State University
Master of Architecture (Urban Design) - University of California at Los Angeles

Honours & Awards

President’s Medal, Australian Institute of Architects, ACT Chapter, 2018
Adjunct Professor, University of Canberra 2012-2015
Doctor of the University (HON) - University of the Sunshine Coast, 2007
Distinguished Achievement Medal, Arizona State University 1985

Professional Memberships

Life Fellow - Australian Institute of Architects
Member - American Institute of Architects


Australian Capital Territory, New South Wales, South Australia, Queensland, New Zealand


Paul Mutton RAIA - Partner


Paul Mutton has over thirty years experience in architectural practice. He joined the firm in 2002 and became a partner in 2008. Paul’s leadership skills are evident in the number and range of projects delivered successfully under his guidance. He has worked as a Project Director on a number of multi-unit residential, commercial and government projects, both in Australia and overseas.

On joining the firm, he took a lead role in the masterplanning, design, documentation and construction phases of the new Canberra International Airport Terminal and associated works, managing the staged construction over a number years, and recently completing the new fit out for International Operations at the airport.

Throughout the phases of the airport project, Paul oversaw a number of projects in the commercial sector, including  design and documentation of the 35,000m2 A-Grade Office building for a significant Commonwealth Government Agency, and a group of 5 A-Grade commercial buildings at Fairbairn Business Precinct in the ACT.

He has since been Project director for variety of projects across sectors, including the Toowoomba Wellcamp Airport in Queensland, a mixed-use residential tower of 240 units in Canberra, a New Town Precinct - multi-residential community of 1,000,000m2, in Xian, PR China, and Kunshan Public Library in Jiangsu Province, PR China, and two diplomatic projects in Canberra.

Currently Paul is Project Director and Design Leader for two regional airport projects in India, Leh Airport in Jammu & Kashmir, and Imphal Airport in Mandipur.

In addition to his architectural work he has been responsible for the documentation and management of the Third Party Certified Quality Assurance System of the Practice.

Prior to joining GMB Paul worked on numerous projects (typically as a project leader) in Adelaide and Sydney including multi-unit residential projects up to a construction value of $90 million.  Several of his projects have been recipients of awards from the Royal Australian Institute of Architects, notably an Award of Merit for a multi-unit residential project and a Sustainable Architecture Award for a new Primary School in the City of Playford in South Australia.

Bachelor of Architectural Studies - University of Adelaide
Bachelor of Architecture (Hons) - University of Adelaide

Professional Memberships
Member - Australian Institute of Architects

South Australia

John Guida RAIA - Partner


John Guida has over twenty years experience working on a broad range of architectural and masterplanning projects in Australia, USA, Europe, Korea, Taiwan and China. His portfolio includes a diverse range of projects such as Art Museums, Libraries, Law Courts, University Buildings, Luxury Residential & Commercial Developments and Bus & Marine Transport facilities. He joined Guida Moseley Brown in 2013 as a Partner and lead designer.

Since joining the firm, John has provided design leadership on a number of significant projects in Canberra, including the award-winning International Operations Fitout at Canberra International Airport, Australia Forum Reference Design for a new national convention centre, a multi-residential project in Turner,  an award winning mixed-use development in Barton, and a New Chancery for the High Commission of India, in Yarralumla. John's international projects include Zongfu Mansion, the design for a multi-residential development in Chengdu, PRC, and the design for Samoa's new Parliament House in Apia, Samoa.

Prior to joining GMB John spent over five years at Asymptote Architecture in New York where he was the lead design manager on a large range of projects, most notably two award winning cruise terminals in Taiwan, two iconic commercial towers in Arata Isozaki’s masterplan for Zhengzhou, China, a pair of visionary luxury residential towers in Seoul and the ARC culture pavilion in Daegu, Korea. Further to this John worked on the cutting edge Strata Tower and award winning YAS Hotel in Abu Dhabi.

John’s professional experience prior to working in New York includes developing and realising a number of projects in both Melbourne and Sydney, in particular overseeing the exterior design of a $65 million law court in Sydney and acting as project manager for a new public library and a town hall renovation in Melbourne, both of which were awarded by the Australian Institute of Architects for excellence in public architecture.

Parallel to his professional career John has a passionate interest in academia, having overseen three final year design studios at The University of Melbourne and participated as guest critic for a design studio at Princeton University, as well as delivering a lecture series at the University of Canberra.

Bachelor of Science in Architecture - University of Newcastle
Bachelor of Architecture (1st Class Hons) – University of Newcastle

Australian Institute of Architects

Andrew Donnelly - Partner


Andrew Donnelly has over twenty-two years’ experience across a broad range of projects locally, nationally and internationally. He joined Guida Moseley Brown Architects in 2007 and became an Associate in 2016, and Partner in 2024.
Andrew has carried out significant roles for projects at a variety of scales including master planning, architectural design, documentation and site observation. He is particularly skilled at directing and coordinating large, diverse user groups and stakeholders, working collaboratively with large consultant group teams both nationally and internationally. He has pioneered the implementation of innovative construction techniques and methodologies delivered in offshore locations, specifically in modular and prefabricated construction.
Andrew brings high quality leadership which is balanced with a highly collaborative approach that achieves well resolved and detailed responses to the most complex of undertakings.


Bachelor of Architecture - University of New South Wales

William Gardner RAIA - Partner


William (Will) Gardner has over seventeen years’ experience across a broad range of projects both in Australia and overseas. Will joined Guida Moseley Brown Architects in 2004 and has lead multi-disciplinary teams locally, nationally and abroad in all facets of planning, design, documentation, tender management, contract administration and superintendency. He was appointed Associate in 2016, and Partner in 2024
Will has been project architect for numerous award winning undertakings locally and nationally and has a particular focus on government, institutional and public buildings as well as interior works. He is a highly effective collaborator, project team leader and manager.
As an active member of the architectural community he was a leader of the Australian Institute of Architects (RAIA) Emerging Architect & Graduate Network National Council, and ACT Chapter Counsellor. In 2019 he was awarded the RAIA ACT Emerging Architect Award in recognition of his professional contributions and achievements.

Bachelor of Applied Science in Environmental Design - University of Canberra
Bachelor of Architecture - University of Canberra

Australian Institute of Architects

Honours & Awards
Emerging Architect Award
Australian Institute of Architects, ACT Chapter


Damian Roos - Associate


Damian joined Guida Moseley Brown Architects in 2009 and has gained experience across a diverse range of projects in the education, government and commercial sectors. He was appointed an Associate in 2022. His approach to architecture is based in a strong understanding of culture and urbanism, which is applied by way of diligence in the design and construction process. He is highly effective at developing design outcomes that are efficient, cost effective and lend themselves to rapid constructability. The skilfulness of this application makes him a highly capable project leader and design collaborator. Damian has been an active member of the architectural community with a particular focus on teaching as a tutor, lecturer and guest critic at the University of Canberra. He has been involved in Design Studio, Architecture Technology and Built Environment subjects across both undergraduate and post-graduate levels.

Gayatri Pathare - Associate


Gayatri joined Guida Moseley Brown Architects in 2005 and has led a wide range of projects in Australia and overseas in a diversity of sectors and building typologies. With twenty years’ experience, she has become a key member of the firm and was appointed an Associate in 2022.

Gayatri has a keen attention to detail at all levels of project leadership. This is evident from project outset right through design, documentation, delivery and project finalisation and quality assurance auditing. She has been duly recognised as a leader who has a strong resonance with clients for her diligence and focus toward timely project delivery as well as maintaining proper and efficient project management and protocols.

She plays an active role in Guida Moseley Brown Architect’s Office Management Systems which involves ensuring the firm maintains third party certification for the Quality Management, Environmental Management and Work Health & Safety Systems.