Strategic Investment & Advisory
Building and investing in businesses that are disruptive, scalable, and noble in purpose.
We bring ideas, people and capital together to reposition companies, accelerate growth and create durable enterprise value.
ABOUT RAINMAKER
Where strategy meets value creation
Rainmaker is a strategic advisory and investment firm that works with founders, operators, and leaders building businesses worth building. We bring decades of hands-on experience across industries and continents, and we show up as true partners, not just advisors.
We’ve launched companies, restructured them, scaled them, and sold them. So when we sit across the table from a management team, we already know what they’re up against. What we offer isn’t just capital. It’s alignment, accountability, and a genuine investment in your success.
CAPITAL STRATEGY OPERATIONS GOVERNANCE
OUR PHILOSOPHY
Three words guide everything we do
Disruptive
We pursue opportunities that challenge the status quo. The companies and initiatives we support don't just compete in existing markets; they reimagine them. We are drawn to bold ideas that have the potential to reshape industries and redefine what is possible.
Scalable
Vision without infrastructure is aspiration. We help our partners build the systems, structures, and strategies that allow a great idea to grow into a great institution. Scale is not just about size; it is about durability, repeatability, and impact that compounds over time.
Noble
We are guided by purpose. The work we do must matter, not just to shareholders, but to customers, employees, and communities who are touched by it. We believe that the most enduring businesses are built on values, and we hold ourselves and our partners to that standard.
VALUE CREATION
Four pathways to transformative growth
Rainmaker deploys four interconnected pathways to create and grow value for the organizations we engage. These are not separate efforts; they are an integrated system designed to accelerate growth, strengthen operations, expand access to capital, and position our partners for long-term success.
01
STRATEGY
Disruptive Strategy
We work with leadership teams to rethink how their company competes. That means finding the angles others have missed, building durable advantage, and structuring the business to generate superior margins.
02
GROWTH
Growth has to be intentional. We help companies scale through a combination of organic momentum and strategic acquisition, clearing the obstacles that slow progress and capitalizing on the opportunities others overlook.
Rapid Scaling
03
CAPITAL
Not all money is good money. We bring our own capital to the table and connect companies with the right investors and partners, people who understand the business and are aligned with where it's going.
Capital Sourcing
04
GOVERNANCE
Strong companies are built on strong foundations. We curate and serve on boards that hold leadership accountable, keep strategy clear, and create the conditions for teams to do their best work.
Good Governance
CASE STUDIES
Where the four pathways have been put to work
A record of building, investing, and advising across multiple industries and geographies.
PORTFOLIO
Selected investments & advisory clients
We invest in founders and teams building transformative solutions in healthcare, education, technology, and beyond. These are the companies we have backed, advised, and grown alongside.
LEADERSHIP
Greg Campbell
PRESIDENT & CEO, RAINMAKER
MANAGING PARTNER, PROSALUS CAPITAL PARTNERS
Greg Campbell has spent over 35 years building, funding, and advising businesses across the United States, Latin America, and West Africa. He brings a wealth of experience in growth strategy, acquisitions, and financial performance. His priority has always been the same: businesses that are disruptive in their model, scalable in their reach, and noble in their purpose.
He has been both a founder and an investor, working with companies from early development through later stages of growth. His focus is on strategic planning, M&A, board governance, and working with management teams to create value. As an investor, he’s held leadership roles in private equity, venture capital, and angel investing.
Greg currently serves on the boards of Tuleva Inc., Assure.ai, and Curis Functional Health. He regularly speaks on entrepreneurship and investing across the country.
Greg’s approach is grounded in a simple belief: a strong idea, guided by a meaningful mission and disciplined execution, can become a business that grows, creates lasting value, and improves lives.
CORNELL UNIVERSITY - B.S.
HARVARD BUSINESS SCHOOL - MBA
GET IN TOUCH
Let’s connect.
We’d love to hear about what you’re building and explore whether there’s a way we can help.