Heather Dubbeldam



Heather Dubbeldam is a Toronto-based architect and designer who comes by her professional passion for modern architecture honestly; as a fourth generation architect, Heather carries on the modernist approach of her Dutch lineage. Having lived abroad and travelled extensively, Heather’s early professional experience and studies in Italy, France, Switzerland and Turkey strongly inform her design work to this day. Heather returned to Toronto to work with internationally recognized architecture firm Kuwabara Payne McKenna Blumberg (KPMB) for over six years as project architect and team member on many award-winning private and institutional buildings. Prior to starting her own multi-disciplinary practice, Heather developed a diverse set of skills in photography, graphic and furniture design; her accomplishments in these fields continue to influence and enrich her architecture work.

Heather is known for exacting standards in the design, detailing and execution of her firm’s projects, her integrity in business, and her dedication to volunteer and leadership work in the profession. She is a licensed architect with the Ontario Association of Architects (OAA) and a Fellow of the Royal Architectural Institute of Canada (FRAIC). Heather promotes a long term vision toward environmental sustainability and a commitment to incorporating sustainable design and systems into her firm’s projects. She is a LEED Accredited Professional and a member of both Sustainable Buildings Canada and the Canada Green Building Council.

In addition to managing a full-time practice, Heather is active as a leader and advocate for the profession. As the recent past Chair of the Toronto Society of Architects (TSA), Heather advocates to ensure architecture and urban design are key considerations in public discussions and processes that have impact on our built environment. Heather is the Vice Chair of the Design Industry Advisory Committee (DIAC) and Co-Director of Twenty + Change, a national organization dedicated to exposing the innovative ideas of emerging Canadian designers. She is the co-editor and author of several architecture and design publications, including the award-winning Toronto Architecture Guide Map and the three catalogues in the Twenty + Change series. Heather regularly makes time to mentor architecture interns and to participate in panel discussions and design charettes. As a visiting critic at schools of architecture and a member of the Ryerson University Program Advisory Council, she helps to make connections between the profession and the educational world.

Derek McCallum

Associate & Senior Project Architect

M.Arch, OAA

As an Associate and part of Dubbeldam’s senior leadership team, Derek is an important bridge between design and technical expertise where he leads project teams from design through construction. His interest in domestic space has inspired his work in custom residential and multi-family buildings, as well as their incorporation into large mixed-use buildings and public space in both rural and urban settings. He has worked extensively in the GTA, and abroad in the Netherlands, Japan, and on projects in Bangladesh, where learning about different architectural ideas and techniques has deeply informed his perspective on sustainable building and models for living.

Derek’s extensive experience on a wide range of scales in housing, including custom homes and multi-unit residential buildings, underscores his commitment to creating spaces that harmonize with their surroundings and enhance the quality of life for their inhabitants, both core design values for our studio. His keen eye for technical details and passion for sustainable design principles ensure that each project not only meets but exceeds expectations for environmental responsibility and energy efficiency.

With over a decade of experience dealing with regulatory authorities for applications involving planning approvals, Derek is our in-house expert at navigating project applications through to successful approval. His collaborative approach fosters strong relationships with clients, consultants, and contractors, resulting in successful outcomes that are both aesthetically pleasing and functionally robust.

Derek’s strong design abilities and creative acumen inform his role as project architect for a number of Dubbeldam’s key projects. Derek is currently leading the design for the renovation and addition to the Ladies’ Golf Club of Toronto, the development of a world class bar and restaurant in Toronto’s trendy Queen West neighbourhood, an eco-cabins resort in Huntsville, and a 35-unit residential rental development project in Toronto’s Baldwin Village neighbourhood.

Andrew Snow

Associate & Project Manager


Since joining Dubbeldam in 2016, Andrew has become an invaluable asset to our team, bringing a people-centred design approach with a strong creative and visual sensibility. After studying geography and anthropology, he pursued his architecture degree from Dalhousie University, fueled by his fascination with architecture’s role in shaping society’s cultural identity and sense of place. He actively pursues his interests in photography and graphic design, using this passion to further his ongoing exploration of the connection between people and their environment. Andrew plays a lead role in the development of our studio’s photographic and graphic assets as well as design studies, enriching the visual narrative of our work.

Andrew’s professional expertise centers on the cultivation of thoughtful and sustainable approaches to heritage structures and contemporary workspaces, where he consistently develops inspiring solutions to the varied challenges of working within existing buildings. He has played a pivotal role in many of our award-winning commercial projects, including the new offices for Azure Magazine, Slack Technologies, and Informa Canada (IDS), as well as a number of sensitive renovations to heritage properties in Toronto where he skillfully navigates the delicate balance between preservation and innovation.

Andrew was the project lead for our Flow House in Toronto, which has received many accolades. Currently, he is leading our House for an Urban Farmer and Cardwell Lake Cottage projects as well as the renovation to heritage properties in Cabbagetown and Wychwood Park. Beyond his professional accomplishments, Andrew’s affable east-coast demeanor brings an approachable and collaborative style to his work, making him a favourite with both clients and contractors alike.

Aaron Finbow

Associate & Senior Project Architect

B.Arch, OAA

As an Associate at Dubbeldam, Aaron Finbow brings over 20 years of experience designing and delivering bespoke, award-winning residential, commercial, and institutional projects for both public and private clients. Highly design-driven and technically oriented, Aaron is known for uniting creative vision with technical ingenuity. He has extensive experience shepherding detailed and complex projects through all stages, from early concept development to construction completion, directing internal teams, coordinating consultants, and facilitating seamless communication with clients, contractors, subtrades, suppliers and regulatory authorities.

As an exceptional designer with an extraordinary eye for detail, Aaron is passionate about hand drawing and sketching as a vital tool for exploring formal and spatial relationships, translating visual concepts into constructible details. He has played a key role in advancing the construction detailing on projects like the Ladies’ Golf Club of Toronto and House in Wychwood Park. Aaron is leading our project with global company Cosentino on their new downtown Toronto City showroom and design hub.

Heather Breeze

Architectural Designer & Marketing Director

B.Arch.Sc, M.Arch, OAA IAP, LEED Green Associate

Heather is an Architectural Designer and the Marketing Director at Dubbeldam with a passion for writing and communication aimed at inspiring dialogue and fostering connections between the architecture profession and the community at large. Heather’s interests revolve around the intersection of public policy and architectural design, and the impact the urban built environment has on citizen engagement.

Heather’s architectural experience includes background with a range of city processes, working experience with heritage restoration and conservation, and stakeholder consultation and engagement. As an architectural designer at Dubbeldam, she has been involved in all project types from the initial proposal and concept stages through to construction documentation, with a particular focus on our multi-unit housing projects and research on liveability.

Prior to joining Dubbeldam, Heather worked in heritage conservation, where she honed her perspective on sustainable design and respect for history and context. Heather served on council at the Ontario Association of Architects and adjacent committees as the Intern Representative, and she currently volunteers on the Executive of the Toronto Society of Architects. Heather’s passion for community involvement and architectural design in the city of Toronto forms her enthusiastic and problem-solving approach to every project.

Logan Carragher

Architectural Designer


Logan is an Intern Architect and architectural designer at Dubbeldam with diverse experience in housing including single family, multi-unit, laneway, long term care, and tiny homes. His academic research into community-based housing and amenity spaces has contributed to the quality of Dubbeldam’s multi-unit residential projects, notably the Missing Middle housing pilot project for CreateTO in Toronto’s East York neighbourhood, a highly sustainable residential development designed to foster a sense of community and promote wellbeing. With a focus on people-centered spaces, Logan’s work embodies a commitment to social sustainability and wellbeing at all scales.

Logan’s keen sense of design and spatial quality, coupled with his skill in clearly illustrating architectural ideas and concepts, enhances the quality and clarity of our projects. His work on the design of Foret Cabins, an eco-cabin resort in northern Ontario, explored alternative ways to achieve the project’s high sustainability targets without compromising on the design objectives.

Logan applies his natural iterative design approach to a wide variety of our project types, rigorously developing creative design concepts that are carried through to the final construction phase, strengthening our commitment to innovation, creativity, and high-quality design.

Alejandra Chauca

Architectural Designer & Research Coordinator


Alejandra is an Intern Architect whose skills in multi-disciplinary research and methodology enable her to seamlessly integrate architectural project work with research and marketing efforts at Dubbeldam. This integration ensures a cohesive transition from investigation to design to presentation, enhancing the overall project development process. Alejandra’s interests lie in the narratives of lived experience and how architecture can help to preserve and foster everyday cultural practices, enhancing communal spaces and fostering community.

Alejandra is involved in a wide range of work at Dubbeldam, including research, the development of exhibitions and competitions, and active participation in project work. She played a key role in collating and designing Dubbeldam’s contribution to the 2023 Venice Architectural Biennale, Reconceptualizing Urban Housing.

Alejandra assists in promoting Dubbeldam’s projects, organizing social media and communications, and preparing presentations and lectures, while working on all stages of design for Dubbeldam’s architectural projects.

Kevin McIntosh

Director of Business Development & Operations

Before joining the Dubbeldam team as our Director of Business Development and Operations in 2016, Kevin owned and operated successful ventures in consulting, marketing, and enterprise software solutions for over 30 years. With a background in business development, finance, IT, and marketing, he manages new business and pursuits, finance, operations, and IT solutions while continuously improving internal efficiencies and project management procedures for our practice. As co-founder with Heather Dubbeldam of Lokaal Coworking, Park(ing) Day Toronto, and partner in the revitalization of the once derelict building that houses Dubbeldam’s studio, Kevin has been instrumental in shaping the practice’s social and environmental sustainability mandates as well as our efforts in community development and urban renewal.

Kevin has served on the Toronto Society of Architects executive board since 2004 as an advocate for the local architecture community. Beginning in 2009, he was instrumental in launching the Toronto Architecture Tours program and the first TSA social media accounts, and continues as co-lead for the popular TSA Connect initiative.

Kevin’s involvement in community building extends to his role as Vice Chair of the Toronto Corso Italia BIA, as operator of Lokaal Coworking, and executive member of Coworking Toronto, a collective of independent coworking spaces in the GTA helping to shape the flexible and remote work industry in Toronto. Kevin’s extensive research into flexible and healthy workspaces has been an invaluable resource for implementation of best practices into Dubbeldam’s workspace projects.

Joanna Dubbeldam

Director of Sustainability

BA, Certified TRUE Advisor, Certificate in Sustainable Management

As Dubbeldam’s Director of Sustainability, Joanna brings over 25 years of diverse business management and sustainability experience to our practice with a background in renewable energy, waste management, marketing, and design. Founder of Sustainability Solutions and creator of ECO Waste Tracker and Waste Conversion Calculator, she specializes in creating actionable strategies and innovative tools to maximize positive impact for both our project work and within our organization.

In addition to credentials from multiple Canadian universities, Joanna holds a Certificate in Sustainable Management from Duke University. She is a certified TRUE Advisor in Zero Waste and holds credentials from the US Green Building Council, along with a certificate in Aquaponics. Joanna has shared her expertise at various speaking engagements, including as an expert panelist for the California Department of Resources Recycling and Recovery, the California state agency responsible for overseeing recycling and waste management programs.

Guided by a steadfast commitment to purpose, Joanna pioneers ground-breaking solutions, supporting and steering organizations toward sustainable practices that align with their core values. Joanna’s commitment to sustainability started as a child and she currently leads a zero waste lifestyle with her family.

Basima Roshan

Human Resources Lead

B. Comm, MBA, CPA

Basima serves as our HR consultant, leveraging her specialized expertise to support our workplace culture with targeted strategies for employee engagement, retention, and performance management. As a strategic partner, Basima collaborates closely with our team, offering comprehensive and ongoing HR support to ensure our organizational and employee success.

Basima holds an MBA from Queen’s University, a Bachelor of Commerce (Finance), a Human Resources Management Certificate from University of Toronto, and is a Chartered Public Accountant (CPA). She has an extensive background working with Fortune-500 companies where she planned and managed cross-functional business operations and complex internal integration projects, increasing their effectiveness and profit.

Basima also plays a role in our Finance, Change Management and Business Strategy efforts, providing strategic advice on financial management, organizational development, and strategic planning.

Michelle Webber

Financial Accounting Manager

With over 15 years of financial management and bookkeeping experience, Michelle diligently oversees and regularly assesses everything related to Dubbeldam’s monetary and financial wellbeing. She has been involved with the evolution of our practice for over 10 years, and her deep understanding of financial matters for an architectural practice ensures that all financial aspects are handled correctly and efficiently.

In recent years, Michelle has also taken on the financial management of Lokaal Coworking, monitoring these complementary operations for our practice. Her expertise in tax compliance and financial analysis ensures our firm’s fiscal responsibility and growth, allowing us to focus on delivering exceptional architectural solutions to our clients.