09/28/2026
Daniel G. Weiss, MA '91, JD '96: One Stanford Alum's Twenty-Five Years on the Climate Investing Frontier
You'll find Daniel G. Weiss in the pages of the Financial Times, Bloomberg, Fast Company, and the Los Angeles Business Journal, where he was recently named one of the region's most influential business leaders. Daniel sat down with us to discuss how Stanford Law School helped form a foundation for his success.
What you won't find in the existing coverage is the person shaped by SLS: a Shakespearean sonnets course, the mentorship that brought him to clean energy in Los Angeles, and his return to campus as a lecturer. That's what this feature sets out to share.
In 2001, Daniel co-founded Angeleno Group with Yaniv Tepper, his undergraduate roommate, after practicing mergers and acquisitions law at O'Melveny & Myers. Twenty-five years later, the firm has become one of the nation's longest-standing venture capital and growth equity firms focused exclusively on clean energy and climate solutions. Its portfolio has generated more than $10 billion in enterprise value, produced roughly 1,000 patents granted or pending in the US, and helped keep an estimated three billion metric tons of carbon out of the atmosphere—work that has also created some 17,500 green-collar jobs along the way.
After Daniel lectured earlier this year on Stanford's campus, Stanford Law School Dean George Triantis invited him to teach a course of his own in the spring of 2027 on climate finance, a fitting continuation of a relationship with SLS that began three decades ago. Additionally, Daniel recently accepted an invitation to join the Stanford Law School Venture Fund (LSVF) board, which helps SLS deploy its endowment in venture deals.
“When we started Angeleno Group, we believed that clean energy and climate solutions would one day become a mainstream area for institutional investors,” Daniel said. “A great deal has changed over twenty-five years around the economics and technology of the sector. Clean energy, efficiency, and water management are now a $10 trillion global industry.”
One element of the industry that surprises him most is not the scale of what has been built, but the nature of what has emerged. “One striking recent development has been the factors driving renewed interest in clean energy,” he said. “It's sparked in part by AI data centers and the enormous demand for power to support them — which we didn’t anticipate when we started out — and more broadly by the electrification of the entire economy, met with a progression of technology that has made renewable energy the cheapest and quickest way to meet that demand.”
In our conversation, Daniel was deliberate about what Stanford Law School gave him. “Some of my most formative experiences came from Stanford Law School, both inside and outside the classroom,” he said.
“Inside, I was taught skills in issue spotting, advocacy, negotiation, and critical thinking — tools that translate directly into evaluating companies and structuring deals.” Daniel’s instinct for exploring past the legal field extended outside the classroom too. He fondly recalled a course he and his classmate Carolyn Wessling, JD '96, once took together on Shakespearean sonnets, for which they received academic credit.
“It might not sound like the most obvious course for two law students to take,” he said, “but it was the kind of thing Stanford encouraged: go find the class that will broaden your thinking and the skills that round you out, not just the one that will look good on your legal résumé. I think that habit of curiosity has served me as much as what I learned in a classroom.”
It was outside the classroom that Daniel met Warren Christopher, JD '49, a distinguished Stanford Law alum and former US Secretary of State.
“I met Chris when I was a student at SLS and he was visiting campus, and he went on to become an important mentor to me,” Daniel recalled. “He taught me the importance of judgment and the power of listening, and the responsibility and privilege of members of the profession for civic engagement.” That relationship led to his first job at O'Melveny & Myers, where, working on energy and power deals, he began to notice a pattern.
“As a transactional lawyer working on deals, particularly in energy and power, I saw firsthand the scarcity of institutional investors focused on clean technology, which at the time wasn't really a category at all,” he said. “That white space was what we set out to fill. In a very real sense, Angeleno Group traces back to meeting Chris at Stanford Law School. His mentorship brought me to O'Melveny, to Los Angeles, and ultimately to co-founding the firm.”
When asked what he's most proud of since graduating, Daniel didn't hesitate. “My family gives me the most joy,” he said.
In his professional life, the answer is the firm he helped build. “I'm very proud of my partners and our team for having built an institutional investment platform focused on sustainability that genuinely did not exist before,” he said. “And twenty-five years in, in many ways, it feels like we're just getting started.”
He points to a decade-long supercycle in climate tech venture capital that began around 2013, a period he described as one when “seeds were planted in a garden of innovation.” Capital flowed then into early-stage companies and first-time entrepreneurs building new technology. Now, he said, even in a political moment when the sector is out of favor in some circles, that generation of companies is reaching growth stage and scale, drawing in a new wave of talent to the sector.
“Every day, we get to work with extraordinary entrepreneurs building high-growth sustainable businesses,” he said. “The level of innovation we're seeing is simply better than ever, in both quality and quantity. We're at an inflection point in the next generation of clean energy and sustainability technologies. We believe this is one of the most compelling moments we've seen to deploy capital in the sector since we founded the firm.”
That sense of perspective is part of what Daniel plans to bring to campus in his course on climate finance. For him, the return to Stanford feels like a full-circle moment: the same place where he learned to spot issues and hone critical thinking skills is now where he plans to prepare the next generation of students to enter the field. He sees real opportunity for Stanford students in climate finance, an industry he believes is entering its most interesting chapter, and views teaching as a way to be of service—to pass along what twenty-five years of betting on what's possible has taught him, and to help students see themselves as part of what comes next.
“We're genuinely excited about the future of sustainable investing,” he said. “And there are good reasons to be.”
-VV
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