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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

Sieglinde Whittle - Partner


After graduating in Architecture, Sieglinde Whittle gained professional experience in Europe and the Middle East prior to joining Mitchell/Giurgola & Thorp Architects, now GMB, in to work on the design development and documentation of the Parliament House. Upon completion of that project she worked in private practice expanding her experience by providing documentation, liaison, and consultation services for clients on numerous residential and commercial projects, as well as teaching from 1994 to 1997.

Since rejoining the firm in 1997, Ms Whittle became an Associate in 2002 and then Principal in 2008. She has undertaken key roles on major public building projects, including a Gallery Redevelopment at the Australian War Memorial, and the State Library of SA Redevelopment where she provided team leadership for the planning,design and documentation of this complex, multi-award winning project.

Sieglinde’s work has further included leadership roles on several large scale high density residential and mixed-use projects in Singapore, and Suzhou and Tianjin in China, as well as a multi-million dollar private residence in Hong Kong surrounded by a nature reserve. She has delivered large commercial projects in Canberra, Brisbane, and Sydney, as well as a number of significant diplomatic projects and two P-10 schools in the ACT. Sieglinde regularly leads ongoing projects at Australian Parliament House, updating and adapting the contemporary heritage building for current workplace and operational standards

Over the last 20 years she assumed the role of project director for more than fifty projects located locally and internationally, including large scale residential projects in China and Singapore, Parliamentary buildings in Australia and Hong Kong, commercial offices for private and government organisations in Australia and Asia as well as significant public buildings in Australia.

With over twenty five-years experience on a broad range of projects, Sieglinde’s skill and expertise in concept design, space planning, design development and documentation, as well as liaison and consultation with clients, consultants and authorities, has been widely acknowledged. Ms Whittle understands complex projects and has the mature professionalism to find integrative resolutions to demanding requirements and participants, and her refined design skills contribute significantly to every project she undertakes.

Diploma of Architecture - University of Applied Sciences Hanover, Germany

John Guida RAIA - Partner


John Guida has over seventeen 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 - Associate


Andrew Donnelly has over eighteen years experience in a broad range of projects of varying scales locally, nationally and internationally with extensive experience in masterplanning, architectural design, documentation and site observation. He has carried out significant roles as project architect for large scale projects, directing and coordinating with significant and diverse user groups and stakeholders and large international consultant group teams, and implementing innovative construction techniques and methodologies delivered in off-shore locations.

Andrew has significant project experience in the government sector, including a lead role as Project Architect for the Australian Parliament House Major Security Upgrades, Group 1 & 2 Works project, and the current major Kitchens upgrade project. Andrew was also a key member of the team leading the interior design development for the Hong Kong Legislative Council chamber at Tamar in Hong Kong.

In the education sector, he held a leading design role as Project Architect, successfully delivering two high-rise student residential and academic developments at Nanyang Technological University in Singapore, which included extensive multi-use podium and public realm designs.

Andrew’s project experience also includes the Master Plan and ongoing review for the University of the Sunshine Coast and preparation of a 25 year Master Plan for Nanyang Technological University, one of Singapore’s leading Universities.

Bachelor of Architecture - University of New South Wales

Brenton Bedell - Associate


Brenton has fourteen years experience across a broad range of projects in both Australia and Asia. He joined the firm in 2009 and became an Associate in 2016.

He has a significant background in the design of residential precincts for private development and site masterplanning for government projects, particularly school environments. The key drivers for these projects is efficient layout with an engaged landscape that allows for multiple modes of interior and exterior use and artwork integration.

Specifically, in the urban design and masterplanning sector, Brenton has worked on an Urban Renewal Project in Singapore - Stamford House, where a new residential and commercial precinct was developed around an existing heritage building with a public plaza. He has recently lead the development of a new confidential Urban Planning project in the ACT, which integrates multiple uses across a precinct on a large site.

Brenton has lead numerous private development projects in both the residential and commercial sector. He was the project architect for the design and DA for a new multi-storey tower at 343 Albert St in Brisbane, it’s urban location, sensitive precinct, and iconic design requiring significant urban planning expertise and involving extensive negotiation and reconciliation of numerous competing stakeholder interests, working within urban design controls. He was project architect for the design and documentation of ‘Sentinel’, a 35,000m2, two tower, multi-storey mixed-use and residential development.

Further to this, Brenton has lead the design and documentation of more than 10 other commercial and multi-unit residential projects located across Canberra, that have successfully progressed from Concept Design, through Development Approval, to Construction and provide him significant insight into the demands of developing urban sites that balance private and public interests.

Master of Architecture - University of Canberra
Bachelor of Applied Science in Architecture - University of Canberra

William Gardner RAIA - Associate


William Gardner (Will) has thirteen years experience in across a broad range of projects both in Australia and overseas. He has lead multi-disciplinary teams locally and abroad in planning, design, documentation, tender management, construction phase contract administration and superintendency. Will has assumed the role of Project Architect for a number of projects, with particular focus on diplomatic, government and public buildings and interior works.

Will lead the team and was superintendent for the award-winning renovation of the heritage listed Swedish Embassy in Canberra. He was also the project architect for the new Parliament of Samoa, Maota Fono building, and was project superintendent for the Shangri-La Hotel Ballroom redevelopment in Sydney, which involved managing multiple building contracts simultaneously with clients, consultants, users and contractors spread across three countries.

Prior to this he was the project architect for the award-winning Botswana High Commission in Deakin, ACT, completed in 2009. In addition, Will has fulfilled design and documentation roles for GMB designed medium to high density residential and student accommodation developments in Malaysia, Hong Kong, and Tianjin, PRC.

He is an active member of the architectural community with contributions ranging from professional advocacy and counselling to student education. He is currently an Australian Institute of Architects (RAIA) Chapter Councillor. Formerly he was Chairman of the Emerging Architects committee and a member of the AIA Emerging Architect and Graduate Network national council for a number of years.

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

Australian Institute of Architects