A Firm Built on Conviction and Craft
Founded in 2008, Architect Black was established with a singular purpose: to build a private equity firm where investment discipline, operational excellence, and genuine partnership converge to create lasting value for all stakeholders.
Eighteen Years of Principled Investing
Over nearly two decades, Architect has deployed more than $8 billion of equity capital across four institutional funds. Our portfolio spans twenty-seven companies across four core sectors, each selected through a rigorous, thesis-driven process.
We have built our reputation not on the volume of transactions completed, but on the quality of outcomes delivered. Our limited partners include the endowments of leading universities, sovereign wealth funds, and prominent family offices who share our commitment to long-term value creation.
The Foundations of Our Practice
Intellectual Rigor
Every investment thesis is stress-tested through independent analysis, proprietary research, and candid debate. We seek to understand what we do not know before committing capital.
Alignment of Interest
Our partners invest meaningfully alongside our limited partners in every fund. We succeed only when our investors and portfolio companies succeed.
Long-Term Orientation
We build businesses for enduring value, not short-term financial engineering. Our holding periods reflect the time required to execute transformational strategies.
Operational Partnership
We do not observe from the boardroom. Our operations team works shoulder-to-shoulder with management to implement initiatives that drive measurable improvement.
Our Senior Team
Jonathan R. Caldwell
Founding Partner & Chief Executive Officer
Prior to founding Architect, Jonathan spent fourteen years at Goldman Sachs in the Principal Investment Area, where he led investments across industrials and business services. He holds an MBA from Harvard Business School and a BA in Economics from Princeton University.
Margaret S. Thornton
Managing Partner & Chief Investment Officer
Margaret brings over twenty years of private equity experience, including senior roles at Bain Capital and TPG. She oversees all investment activity and chairs the Investment Committee. She holds an MBA from The Wharton School and a BS in Engineering from MIT.
David K. Harrington
Partner, Head of Operations
David leads the firm's portfolio operations practice, working directly with management teams to implement value creation initiatives. Previously, he served as COO of a Fortune 500 industrial conglomerate. He holds an MBA from Columbia Business School.
Catherine L. Prescott
Partner, Healthcare
Catherine leads Architect's healthcare investing practice. She previously served as a Partner at Welsh, Carson, Anderson & Stowe and began her career in healthcare investment banking at Morgan Stanley. She holds an MBA from Stanford Graduate School of Business.