Our People

We are constantly listening, learning and adapting. That defines what we do.
It is our commitment to sustainability, that defines who we are.
Together, our vision is to create transformative environments, having fun in the process.

Joanne McCallum

Director

B.A., M.E.Des.(Arch.), OAA, FRAIC, LEED AP

As Co-founder and Director, Joanne provides direction and oversight on a full range of building typologies. Her work is informed by vigorous research and careful client consultation, working from first principles in a way that thoughtfully translates her clients’ needs into physical reality.

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Greg Sather

Director

B.Arch., OAA, MRAIC, LEED AP

Co-founder and Director, Greg is responsible for design direction, sustainable design initiatives and providing technical excellence oversight for the firm’s projects. His experience with the design of high performing spaces has resulted in ground breaking projects and firmly established his reputation as a leader in sustainable design.

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Drew Hauser

Director

Hons. Vis. Arts., B.Arch., OAA, MRAIC, CAHP

As Director, an artist and businessman, Drew is passionate about shaping environments that put our clients’ business and Research objectives at the forefront. He has been instrumental in providing award winning design solutions that establishes a precedent or prototype.

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Dora Lomax

Principal, Interior Design Lead

NCIDQ, ARIDO, IDC, LEED® AP

Dora has shaped beautiful and impactful interiors, from complex healthcare projects to multi-unit residential developments. She brings a depth of understanding in how to creatively connect the science of design with our clients’ objectives, delivering spaces that meaningfully advance our clients’ goals.

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Michelle Austin

Principal

MAATO, OBEC, LEED AP

Michelle embodies exceptional knowledge and management skills related to the construction process. She is responsible for the firm’s field review services and provides critical peer review oversight on all of our documentation, ensuring projects meet or exceed the firm’s exacting standards.

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Andrew Gunn

Principal

B.Arch., Dipl.T. (Arch.), OAA, MRAIC, CHES, LEED AP

Andrew approaches his work with a mix of pragmatism and creativity, an ideal fit for the firm’s most complex building projects. He has a particular strength in creating healthcare and specialized laboratory environments where his history as an emergency medical technician gives him a distinct advantage in the design process.

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Mary Georgious

Mechanical Engineering Lead

P.ENG, LEED AP BD+C

An enthusiastic leader, Mary offers extensive experience in HVAC, fire protection, plumbing and medical gas system design. As the firm’s mechanical engineering lead, one of Mary’s specific strengths is in project management and problem solving, ensuring that all mechanical solutions seamlessly integrate into a project’s design.

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Heather Gordon

CFO

CPA, MACC

Heather brings years of financial and business experience to mcCallumSather. With her professional Chartered Accountant designation and Masters of Accounting degree, she ensures that all aspects of the business and all projects are managed with financial integrity.

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