FROM HUMBLE BEGINNINGS TO WORLD-CLASS PLAYER
Building Trust Through Excellence For More Than 30 Years
At conceptcsi, we’re proud of our journey from humble beginnings to a world-class name in commercial construction. We value the global recognition that has come with it, but what inspires us every day is the trust our clients place in us. That trust has turned many first-time clients into loyal, long-term partners, carried our name far and wide, and become a hallmark of every project in our diverse portfolio. We keep it simple: we’re there when you need us, we do as we say, and we deliver.
Our Story
Founded on a commitment to reliability, quality and integrity, conceptcsi steadily built a reputation as one of New York’s leading subcontractors, specializing in drywall, acoustics, carpentry and millwork for the city’s Class A buildings.
Building on our growing reputation, we made a defining step up, from specialist subcontractor to full-service general contractor and construction manager. That elevation took us into mission-critical construction and established conceptcsi as a premier boutique data center builder. With a global colocation provider as our anchor client, we arrived on the national stage, completing a landmark data center campus in Piscataway, New Jersey and cementing our standing as a trusted specialist in one of construction’s most demanding sectors.
Firmly established as a market leader, we strategically broadened our focus, carrying the discipline of our mission-critical work into corporate interiors, healthcare, critical infrastructure, hospitality, retail and adaptive reuse, and becoming the multi-sector specialist we are today.
Trusted by the world’s leading brands, we’ve delivered projects across 17 U.S. states and 23 countries. The standards forged through years of data center construction now shape every one of our projects, in each sector. Wherever we build next, those standards go with us.
3-Pillar Power
By getting the basics right, we build invaluable relationships with our clients. Everything we do rests on three essential pillars:
CLIENT
Your satisfaction is how we measure a project’s success
Schedule
We deliver when we say we will.
Cost
We work strictly to your budget, from start to finish.
Our Approach
‘Too many moving parts, not enough time, and someone saying it can’t be done: that’s been the starting point for every project we’re proud of. Coordinating dozens of trades against a date that won’t move is one of the toughest challenges in this business; it’s the reason I started this company and it’s become our specialty’
Sean Mulleady
conceptcsi CEO
Committed Collaboration
The name conceptcsi is synonymous with outstanding client service and lasting partnership. We believe construction is never just about building something great; it’s about creating something exceptional together. That’s why our approach is rooted in genuine partnership, transparency, and shared goals. From early planning through closeout, we align with every stakeholder and work as one team, establishing clarity around scope, schedule, and budget. Throughout, we take full ownership of every project, provide constant support, and drive it to a successful finish.
Singular Solutions
Whether it’s your state-of-the-art HQ or your technology nerve center, we know your project is unique and important, and that’s how we approach it. From the first conversation and initial drawing set through construction and closeout, it’s about you, your objectives and the one-of-a-kind solution we bring.
Hard-Wired Quality
Our quality assurance is built on careful planning, resource allocation and precise organization. We combine these fundamentals with clear communication, collaboration and agile problem-solving to deliver every project to a consistently high standard.
Trusted Team for Real Relationships
Showing up at our best isn’t optional. It’s about integrity, accountability and being truly invested in your project. Facing challenges with honesty and finding a way forward makes all the difference to your peace of mind, your schedule, and your budget.
Thriving on Challenge
“We have a passion for navigating complex coordination and logistics, tight schedules and the risk that comes with them.”
– Sean Mulleady, conceptcsi CEO
We have deep experience in complex, specialized projects and a strong reputation for delivering them. We’re a team of intuitive problem-solvers with a thirst for innovation and a drive to break new ground.
Next-Level People
Our people are our lifeblood, and our commitment to personal, caring service shapes how our on-site project team operates. We’re proud of our diverse, highly qualified professionals; it means you can trust that every conceptcsi team member has the skill and expertise to deliver sophisticated projects with a customer-focused approach. Most importantly, you have the confidence that your project has owner-level commitment and hands-on involvement.
On-Site Leadership
Our project team is experienced in managing fast-paced, complex projects, particularly those involving live operating environments. We recognize the unpredictability of active jobsites, and we’re equipped to adapt. Your conceptcsi team will be fully site-based, backed by senior management and regular oversight that keeps every decision timely, well-informed and balanced across competing priorities.
Execution Planning
At project kick-off, we collaborate with key stakeholders to develop an Execution Plan. This plan closes information gaps, identifies potential risks and how to mitigate them, then maps out the critical path and project scope. The project team reviews and approves it before implementation begins.
Risk and Cost Management
From the outset, our preconstruction team works with stakeholders to identify budget constraints, then leads a structured value-alignment process that keeps scope and cost in step. Working with operations, consultants and trade partners, the team develops risk-mitigation strategies and establishes a clear, achievable path within an agreed budget.
Schedule Approach
A realistic schedule is one you actually hit. We build ours from the ground up, sequencing trades logically, identifying long-lead items early, and setting clear milestones everyone can plan against. Throughout construction, we work to short-interval look-ahead schedules and review progress continuously, so we can resequence and recover time the moment something shifts. The result is delivery you can count on and complete clarity on your timeline.
Safety First
The safety of everyone on site is our first commitment, one we never compromise on for speed or cost. From detailed site-safety planning and ongoing training to proactive hazard management on every project, we treat safety as the foundation everything else is built on. The only outcome we’ll accept is everyone going home safe.
Our Team
New York
Sean Mulleady
Founder & CEO
Sean leads conceptcsi with more than 30 years of industry experience spanning major projects on both sides of the Atlantic. As CEO, he owns the company’s long-term vision, strategic growth, and client/partner relationships. He stays hands-on at every level of the business.
What sets Sean apart is how he engages with clients, directly and early. Before a single decision gets made about how to build and deliver, he works to understand their requirements, chokepoints, and what’s really driving the job. That habit has shaped the culture of the entire firm and made conceptcsi a very different kind of construction partner.
His leadership philosophy is plain: deliver what we promise, communicate openly, and treat every project as a long-term relationship rather than a transaction. He champions operational excellence and constant improvement throughout the organization and has built conceptcsi into a firm known for efficient, innovative delivery of technically demanding projects.
Sean leads a team that measures success the only way that matters in this business, client satisfaction, repeat business, and the answer to one question: would you hire us again?
Clare Cunningham
Chief Financial Officer
Clare is an accomplished finance leader with over 12 years of experience in accounting, financial strategy, and operational leadership across multiple sectors. As Chief Financial Officer at conceptcsi, she oversees both finance and internal operations, driving strategic planning, financial reporting, project profitability analysis, and risk management. Clare holds a B.A. (Honors) in Accounting and Finance and certifications from Harvard Business School Online and IAP Career College. Known for her analytical and solution-focused approach, she consistently drives results that enhance financial performance and support sustainable growth.
Derek Venne
Vice President of Strategic Development
Derek plays an essential role in cultivating long-term partnerships and driving the firm’s growth across multiple sectors. With a deep understanding of the construction industry and a client-first mindset, he builds trusted relationships grounded in transparency, reliability, and results. Derek bridges the gap between client vision and project execution, ensuring every engagement is aligned with our commitment to quality and service.
Brad Morgan
Head of Construction
As Head of Construction, Brad brings over 20 years of experience in the construction industry and 15 years in the Mission Critical Sector. Brad oversees the construction phase of all projects at conceptcsi, ensuring timely and high-quality execution. He excels in team management, safety compliance, and project coordination, particularly in projects requiring complex trade management. Brad’s meticulous attention to detail and steadfast determination ensures every project meets the client’s expectations for quality, cost, and delivery timelines.
Jeff O’Connor
Head of Estimating
With a First Class Honours degree in Quantity Surveying, Jeff brings a high level of technical expertise to his role, delivering accurate, detailed cost projections that form the foundation of every successful project. His deep understanding of drawings, specifications, and market conditions ensures that estimates are precise and aligned with project goals and client expectations. Jeff’s strong background in preconstruction, cost management, and value engineering plays a key role in minimizing risk and maximizing value.
