Passionate & Experienced in Healthcare
Stone Mountain Ventures was founded to invest in founders who are ambitious and pursuing solutions for better healthcare.
What We Believe
We invest exclusively in healthcare
Our focus spans the full healthcare ecosystem, backing companies building essential infrastructure, services, and technology that power the system. Years of operating, investing, and building relationships across healthcare create a deep network that helps founders navigate growth and scale responsibly. Focus is what allows us to be thoughtful, consistent, and high-conviction partners.
Early and Close
We come in at pre-seed and seed, when founders need more than capital. We stay close through the build.
Capital Efficiency Matters
We back founders who can do more with less. Healthcare has enough inefficiency already.
John Diaz
Founder & Managing Partner
John founded Stone Mountain Ventures in 2021. Before launching the firm, he worked at Bain Capital Private Equity as an Associate within the Healthcare group and gained deep insight to how large scale companies operate and the levers that are pulled for growth and efficiency, while improving patient outcomes. Earlier in his career, he spent time at Wellington Management, Goldman Sachs, and Bloomberg.
He has founded three companies and acquired and operated two others, which he later sold. This experience gives him a deep, practical understanding of building, operating, and scaling businesses, managing teams, and navigating highly regulated markets.
John comes from a family with deep roots in healthcare. His parents and four siblings have all worked directly in the industry, most as a provider, shaping his perspective from an early age and grounding his investment approach in firsthand exposure to how healthcare systems actually function.
Healthcare Runs Deep
Healthcare is not just a sector to me. It is the backdrop of my life. I grew up in a family of providers, where my parents and siblings built their careers on the front lines of care. At our dinner table, the conversation was rarely about clinical wins alone. It was about the exhaustion of trying to deliver top-tier care while navigating broken workflows and systemic friction. My commitment to this industry was not just inherited, but forged through my own experience inside that same fragmented system.
At twelve years old, I was sent to a therapeutic boarding school in the mountains of North Carolina. It was my first exposure to the administrative maze of behavioral health. As I cycled through six schools before landing on the right support, I witnessed firsthand the cost and friction families face at their most vulnerable. That experience revealed the cracks in how we manage mental health, but it also forced me to develop grit, accountability, and a deeply solution-oriented mindset. I named Stone Mountain Ventures after that school. To me, it represents resilience: staying grounded and unbreakable even when the landscape is shifting, and a commitment to fixing a system that nearly let me slip through the cracks.
Years later, that resilience was tested again. While working in New York City, I was hospitalized for two weeks with a critical illness. I underwent multiple blood transfusions and constant imaging, eventually coding in the ICU before an emergency surgery. Although the clinicians were exceptional, the system around them told a different story. Even in one of the world’s leading medical hubs, there was constant confusion and little clarity across the broader system. The breakdowns were not clinical. They were operational. Silos, miscommunication, and fragmented workflows created chaos that even the best providers could not overcome.
Those experiences did more than shape my perspective. They defined what I believe needs to change and why it matters.
I founded this firm to back founders who share that same sense of ownership and resilience. My experience at institutions like Bain Capital and Goldman Sachs taught me how systems scale and how capital drives efficiency. But my time as a patient taught me what is at stake. We are not looking for incremental change. We are looking for builders who are as durable as the problems they are solving. If you are building infrastructure and technology within the healthcare ecosystem, especially if it ensures the next patient does not have to fight the system just to receive great care, we want to be part of that journey.
