Our team

Andrew's leadership is defined by clarity of vision, creative courage, and deep collaboration. With a passion for spaces that elevate daily life, he blends timeless design principles with future-focused thinking, championing innovation in materials, technology, and sustainability. This has resulted in numerous awards including the Sir Zelman Cowen Award for Public Architecture and the Victorian Architecture Medal which were awarded to the Monash University Woodside Building for Technology and Design in 2021.

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Known for his entrepreneurial drive, Andrew leads projects with a sharp understanding of investment and acquisition, balancing broad value with design integrity. His leadership on the complex Metro Martin Place Station and Precinct, in collaboration with Macquarie Group, is a defining example.

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Over three decades Andrew has built a portfolio of work across transport and sports infrastructure, educational and science facilities, modular housing, commercial towers, and the industrial design of urban furniture and componentry.

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His strategic insight is at the core of OCG, seeking out clients and projects that wish to make a lasting impact.

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Mark is an architect and urban strategist with over two decades of international experience. His leadership combines technical depth, strategic clarity, and a deep commitment to the people who shape and are shaped by the built environment. Originally from London, Mark brings a global perspective in formed by work across complex urban contexts. Yet it is Sydney and Brisbane that fuel his passion for place, possibility, and transformation. His expertise spans transport planning, civic and housing masterplans, industrial design, and sports projects.

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From large-scale city frameworks to finely detailed public spaces, Mark works fluidly across sectors, always guided by a belief in design that endures, uplifts, and serves. A notable example of this is the Parramatta Aquatic Centre, recipient of the 2024 AIA Sulman Medal for Public Architecture – a project that exemplifies his commitment to civic impact and design excellence.

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As Managing Director and team leader of the Sydney and Brisbane studios, Mark plays a central role in mentoring emerging leaders and shaping a studio culture grounded in integrity, ambition, and impact.

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Beyond practice, he contributes to the future of the profession through teaching and critique at leading Australian universities, supporting the next generation of architects and urban thinkers.

Annalisa is a multi-award-winning architecture student who believes that good design should make a meaningful impact for the greatest number of people. Her approach combines creative vision with practical, context-aware solutions, carefully balancing client needs with the surrounding environment.

Christian Thuesen is a registered architect and design practitioner with over 18 years of experience across residential, transport, commercial, and industrial projects. He specialises in the design, coordination, and technical resolution of complex projects, ensuring design integrity is carried through every stage of delivery.

As Practice Director, Christian fosters a collaborative and supportive studio culture, strengthening the practice through design quality, technical assurance, and a commitment to collective success. His leadership underpins the practice’s ability to consistently deliver projects of enduring value and architectural merit.

Jeffrey is a registered architect with over 10 years of experience. He leverages advanced digital workflows to design people-centric architecture that is innovative, sustainable, and enduring. He has extensive experience across the full project lifecycle from inception, concept design through to delivery in complex, multidisciplinary residential, commercial, industrial and transportation projects.

Jeffrey was awarded the Master of Architecture Graduate of the Year at the University of Sydney. He actively contributes to architectural education and tutors in Advanced Construction and Structures at the University of New South Wales, as well as Computational Design at the University of Sydney.

Mathew has over 25 years of wide-ranging experience within the industry across various project scales and typologies. He has developed his skills during this time with a broad expertise ranging from project inception through to project completion, with a focus on maintaining these skill sets through continued involvement across the various project phases.

Mathew understands the importance of collaboration with various stakeholders, including clients, authorities, consultants, and contractors and actively seeks opportunities for professional development and growth within the profession, whether it’s exploring innovative construction techniques, emerging sustainable practices, or new technologies, all to the benefit of the clients, their projects, and the projects end users.

Michael has built an extensive career in Australia and internationally, working across architecture, master planning, and interior design. His practice is defined by collaboration and a commitment to design excellence, consistently delivering outcomes that balance the aspirations of clients with the needs of the wider community.

With a deep appreciation for responsible design, rigorous documentation, and the complexities of approval processes, Michael brings a grounded and disciplined approach to every project. This foundation, shaped by years of experience and influence, has been central to achieving enduring and successful outcomes.

Michael’s work reflects a timeless quality, where thoughtful design, technical precision, and community benefit come together to create projects of lasting value for all stakeholders.

Michelle is a designer with extensive experience across a range of large-scale commercial and residential projects. She integrates computational design into her practice to effectively assess and develop creative design solutions.

Alongside her practice experience, Michelle teaches Architectural Modelling and Prototyping as well as Computational Design at the University of Sydney.

With over 5 years of experience in Sydney architecture practices, Stephanie has contributed to projects spanning diverse sectors and scales, from concept to delivery. She brings strong technical expertise in documentation and coordination, coupled with a design-led approach that integrates sustainability and buildability. Her focus is on delivering efficient, well-resolved outcomes that balance creative intent with practical execution.

Tim Dyer is an accomplished architect with over 20 years of Australian and international experience, leading the delivery of complex and large-scale projects across transport, infrastructure, commercial, hospitality and sports sectors. His expertise spans the entire project lifecycle, ranging from strategic business case development and early concept design through to detailed documentation and construction delivery.

As an Associate Director, Tim plays a pivotal role in guiding teams and clients through challenging design and delivery processes, consistently achieving outcomes that balance innovation, functionality, and long-term value.

Vincent is a Graduate of Architecture with three years of experience across residential, commercial, and transport projects. Specialising in concept design and master planning, he takes a balanced approach to architecture, combining creative engagement and sensitivity to context with attuned computational and technical skills to deliver outcomes that are both thoughtful and people-focused. Having lived and worked in Sydney, his work is informed by an appreciation for the character and memory of place.

With more than 30 years of professional experience, Wayne Henkel has established a distinguished career across Australia, the UK, China, and Southeast Asia, including Singapore, Malaysia, and Indonesia. His work spans a broad spectrum of building types and scales, from complex commercial developments to bespoke architectural projects.

Wayne’s expertise lies in seamlessly integrating design, detailing, documentation, and consultant coordination to deliver projects of clarity and precision. His ability to manage the full breadth of architectural services, from concept through to completion, ensures a consistently high standard of delivery across all sectors.

William is a strategic and creative design leader with over 15 years of international experience in the delivery of award-winning, city-shaping projects across a broad range of scales and sectors including cultural, master planning, transportation, commercial, and residential. Central to his approach is a commitment to working collaboratively and innovatively to deliver socially and environmentally conscious solutions of architectural distinction. His work is driven by the belief that architecture should place people at the forefront of the agenda - championing thoughtful, well-executed and enduring outcomes that provide broad-spectrum value for stakeholders and communities.

Having worked extensively across the UK and Australia, William is well-versed in leading high profile, demanding and complex projects. He brings particular expertise in the adaptive re-use and transformation of existing buildings, helping both private and cultural institutions in creating resilient, adaptable spaces that reveal meaningful and authentic narratives about each project’s context, stimulating the imagination and memory of its inhabitants and the broader society.

Yijia is a recent Master of Architecture graduate from the University of Sydney with experience spanning architecture, master planning, landscape, and competition projects. Bringing a fresh and innovative perspective, Yijia contributes strong design ideas and ensures effective outcomes through dedication and consistent effort.

Passionate about sustainability and the integration of local cultural heritage, Yijia is committed to creating architecture that is both environmentally responsible and deeply connected to place.