About Simplex Advisory

Founded in Sydney in 2024, Simplex Advisory began with a simple vision: commercial advice in construction should be clearer, sharper, and more strategic. Too often, businesses are forced to make high-value decisions with incomplete information and ambiguous analysis.

Our mission is to change that.

Our expertise lies in contract risk management, claims, and independent advice. We help clients establish commercial frameworks, identify risks early, and negotiate with confidence.

Independence is at the core of our approach. Free from conflicts, our advice is objective, evidence-based, and focused on achieving the best outcomes for our clients.

We help our clients scale sustainably and make confident decisions by providing the clarity needed to resolve issues efficiently and on solid commercial ground.

Based in Sydney and servicing projects across Australia, Simplex Advisory delivers one thing above all else: advice with impact.

Our People

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    Yiorgos Crespis

    Yiorgos believes that clarity and commercial rigour are the foundations of better project, client, and community outcomes. As the founder of Simplex Advisory, he has led the firm through a period of rapid growth, establishing it as a trusted partner on some of Australia’s most complex projects. With a proven track record in independent expert advice, commercial strategy, and business growth, Yiorgos brings deep expertise in delay and disruption disputes, consistently delivering high-value results for clients.

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    Aleks Rakic

    Aleks is a qualified Civil Engineer and Architect with over a decade of experience delivering major infrastructure and commercial projects. She specialises in procurement strategy, cost estimating, and contract management. Aleks brings sharp commercial acumen and technical insight to all stages of project delivery, from tender through to completion.

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    Jeannette O’Reilly

    Jeannette is a consultant with a strong foundation in legal analysis, stakeholder communication, and commercial operations. With experience across both government and private sectors, she supports clients with contract assessment, compliance, and project coordination. Jeannette brings a detail-oriented, solutions-focused approach to advisory services in the construction and infrastructure space.

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    Samuel Gilbert

    Samuel is a seasoned Commercial Contracts Manager and Lawyer with over a decade of experience delivering major infrastructure and utility projects. He specialises in contract negotiation, commercial strategy, and lifecycle contract management, with a track record of resolving complex disputes and delivering commercial outcomes. ​

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    Gabriella Mills

    Gabriella is a legal professional with experience in dispute resolution, regulatory compliance, commercial advisory, and strategic governance. She has held roles in consultant, private, and in-house capacities across diverse sectors, including construction, healthcare, insurance, and technology. Bringing commercial acumen, clear communication and a collaborative approach, Gabriella minimizes risks during all phases of a project's lifecycle to achieve optimal commercial outcomes for her clients. 

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    Andrew Stanton

    Andrew is a dual-qualified Project Manager and Quantity Surveyor with over 20 years of experience delivering high-profile public and private sector projects across the globe. Known for his meticulous project definition and management skills, he has a proven track record of completing complex projects on time and under budget, achieving award-winning outcomes. His success is rooted in robust project frameworks that ensure clarity and alignment from inception to delivery. Working extensively with top ASX-listed companies, councils, and non-profits, he demonstrates his ability to foster productive stakeholder relationships and deliver exceptional outcomes. 

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    Patrick Liu

    Patrick harnesses his technical background in civil engineering and architecture with his analytical discipline, strategic insight and understanding of commercial risk to support major infrastructure projects. He confidently deploys this skillset in contract administration, commercial advisory, claims management and stakeholder coordination with a particular focus on drafting robust commercial responses to claims and variations, analysing contractual entitlements, and leading end-to-end payment claim assessment processes.

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