Beyond the Numbers: A Conversation with Percy Williams
What does it really take to lead a successful project? For Percy Williams, the answer goes beyond technical expertise. It comes down to financial understanding, anticipating risks, and having the courage to act before problems grow.
Every project tells a story through its numbers. But understanding those numbers, spotting what might go wrong, and making the right decisions takes more than a spreadsheet.
In his book The AEC Project Controls Playbook, Percy Williams explores the connection between project management, financial discipline, and leadership.
We spoke with Percy about the inspiration behind his book, the surprising connection between military intelligence and project controls, and why he believes strong financial leadership is essential to successful projects.
What was the moment you realized this book needed to exist?
The idea for The AEC Project Controls Playbook evolved from an initial concept focused on cash flow management into a practical resource addressing a broader need within the Architecture, Engineering, and Construction (AEC), Energy, and Life Sciences industries.
Throughout my career, I recognized that technical competence alone does not guarantee project success. Project Managers, Project Accountants, Project Controls Professionals, and other project leaders must also understand the financial and commercial aspects of their projects. They need to know how to interpret financial information, manage budgets, forecast costs, recognize risks, maintain billing discipline, accelerate cash flow, and protect profitability.
I wanted to create a playbook that bridges the gap between technical execution and financial leadership by providing proven best practices that help project teams make informed decisions, maintain financial discipline, and deliver projects with integrity.
Also, the book addresses some recurring problems in the AEC and Life Science industries, such as Profit Fade, Cash Flow Volatility, Chronic PM Turnover and Unpredictable Project Outcomes. Ultimately, the book was written to help put project team leadership in a stronger position to WIN.
What’s one fascinating story behind your book that readers won’t find in its pages?
One of the unique influences behind my book is my background as a former U.S. Marine Corps All-Source Intelligence Analyst.
During my military service, I learned the importance of gathering information, evaluating multiple sources, identifying potential threats, assessing risks, and anticipating what could happen next. These principles were essential to Intelligence Preparation of the Battlefield.
I later recognized how this same analytical mindset could be applied to project controls and financial management. Instead of analyzing a battlefield, I analyze project budgets, forecasts, actual costs, billing performance, cash flow, contractual obligations, and emerging financial risks.
Just as military leaders must anticipate threats before they jeopardize a mission, project leaders must identify financial warning signs before they erode profitability or disrupt cash flow.
My military experience helped shape my belief that effective project controls is not simply about reporting what has already happened; it is about anticipating what could happen and taking informed action.
That connection between intelligence analysis, financial discipline, and leadership is one of the underlying philosophies that inspired The AEC Project Controls Playbook.
“Information is potential power; the application of sound information and unchanging principles is real power.”— Percy Williams
Did writing this book change the way you see the world or challenge something you once believed?
Writing this book reinforced a principle that has shaped both my military and professional careers: Information is potential power; the application of sound information and unchanging principles is real power.
We live in a world where information, technology, and artificial intelligence are becoming increasingly accessible. However, access to information does not automatically produce wisdom, sound judgment, or successful outcomes.
The difference lies in how we interpret the information, apply proven principles, and act on what the information reveals.
In project controls, a budget, forecast, financial report, or dashboard is only valuable if it helps someone make a better decision. Identifying a cost overrun is important, but understanding its cause, assessing its impact on the final project outcome, and taking corrective action is where leadership makes the difference.
This reinforced my belief that successful project leadership requires more than technical competence. It requires financial understanding, sound judgment, communication, courage, and character—the integrity to act on the facts, even when the facts are uncomfortable.
If readers could remember just one thing from your book five years from now, what would you want it to be?
I would want readers to remember that protecting profitability and optimizing cash flow are leadership responsibilities, not merely accounting functions.
Although The AEC Project Controls Playbook was developed primarily for professionals in Architecture, Engineering, Construction, Energy, and Life Sciences, its core principles apply to virtually any for-profit organization, regardless of its size or industry.
Every organization must understand its financial position, manage costs, fulfill contractual obligations, recognize risks, maintain billing and collection discipline, and make decisions that support sustainable profitability.
My hope is that five years from now, project leaders will be more financially savvy, Finance and Operations teams will work together more effectively, and organizations will make better decisions because they understand the connection between project execution, profitability, and cash flow.
The ultimate lesson is simple: Don’t just manage the work. Understand the numbers, protect the profit, optimize the cash flow, and deliver with integrity.
What’s one question you’re still searching for an answer to, even after finishing your book?
The question I continue to explore is: How can we consistently transform technically competent project managers into financially savvy project leaders who protect profitability, optimize cash flow, and deliver successful outcomes with integrity?
Writing the book was one step toward answering that question, but the challenge extends beyond publishing a resource. Organizations must also consider how they train, mentor, and empower project leaders to understand the financial consequences of their decisions.
Project Managers are often expected to manage complex projects, people, schedules, clients, and technical challenges while receiving limited formal training in project finance and commercial management.
At the same time, Finance professionals may understand the numbers but lack direct involvement in day-to-day project execution.
I believe the opportunity lies in bringing these disciplines together—equipping project teams with practical tools, strengthening collaboration between Finance and Operations, and cultivating the character and courage needed to act on financial information.
My continuing mission is to educate and empower Project Managers, Project Controls Professionals, and Project Leaders to WIN—not simply by completing projects, but by delivering results that are financially sound, operationally successful, and grounded in integrity.
Invest. Inspire. Impact. Move Forward is my motto.
“Don’t just manage the work. Understand the numbers, protect the profit, optimize the cash flow, and deliver with integrity.”
— Percy Williams