Quick facts about me!

UC San Diego Class of ‘25–B.S. Cognitive & Behavioral Neuroscience

CALPIRG Students San Diego Chapter Chair
worked on passing SB 54 (2022), SB 244 (2023), and SB 1053 (2024)

AMCA Moot Court National Competitor

Sustainable Investment Group Director of Project Management, Senior Sustainability Analyst

Byul Sak leading a group discussion at CALPIRG's annual statewide lobby conference at UC Davis
Byul Sak and CALPIRG members alongside California Natural Resources Secretary Wade Crowfoot, at the Matlahuayl Marine Protected Area press conference
Byul Sak and teammates secure victory at UNLV Law School's Undergraduate Moot Court Competition
Byul Sak presenting on Feasibility of Adoption for NextEra Energy during UCSD Sustainable Investment Group's Fall 2024 Stock Pitch Competition

My story

Byul Sak speaking at a UCSD CALPIRG rally to Protect our Oceans

I’m a cognitive & behavioral neuroscience major with a deep interest in systems thinking and a lifelong passion for protecting the environment. At first glance, my academic background may seem disconnected from sustainability–but in reality, it’s one of the most intentional choices I’ve made. I chose not to switch to a more “conventional” major like environmental science or business because I believe psychology–the way people think, make decisions, and respond to crises–is fundamental to tackling climate change. Whether we're influencing consumer behavior, designing policy, or holding corporations accountable, understanding the human mind is key to driving meaningful action.

My coursework has been deeply interdisciplinary. Through law and sociology classes, I’ve explored how policy, social norms, and systemic structures shape public engagement with sustainability. My psychology courses have helped me understand why people resist change, what motivates them, and how narratives can move them emotionally and behaviorally. I’ve taken highly relevant classes on corporate social responsibility and the psychology of the climate crisis, and I’m currently writing a senior thesis on how psychological storytelling can be used to inspire lasting civic engagement and climate action.

My zeal for environmentalism first took shape through my work with CALPIRG Students, where I served as Chair of the San Diego chapter and led the “Beyond Plastic” initiative. During my time with CALPIRG, I led policy advocacy campaigns that helped pass several major anti-waste laws in California, including SB 54 (Allen, 2022) holding plastic producers fiscally responsible for waste, SB 244 (Eggman, 2023) establishing a right to repair electronics to combat e-waste, and SB 1053 (Blakespear, 2024) banning plastic bags at retail stores. I also played a key role in helping pass a 2022 San Diego city ordinance completely banning harmful polystyrene foam. On campus, I educated thousands of students about pressing current issues, trained hundreds of students as activists and leaders, and fundraised over six figures. Off-campus, I lobbied legislators in Sacramento and in San Diego, facilitated nonprofit coalitions, and secured media coverage for our biggest activism wins. Through grassroots organizing, lobbying, and stakeholder engagement, I saw firsthand how public interest activism and environmental policy can drive meaningful change.

But I also saw its limits. Policy alone can’t solve the climate crisis—especially when corporations find ways to delay, dilute, or outright ignore regulations. A clear example I witnessed firsthand was California’s original 2015 plastic bag ban, which contained a loophole that allowed companies to continue distributing thick plastic “reusable” bags that were still harmful and rarely reused. It took nearly a decade to close that loophole with SB 1053—and even now, plastic bags are still in circulation across the state, revealing just how fragile policy victories can be without enforcement, oversight, and private sector accountability.

That realization sparked my pivot toward corporate sustainability and ESG analysis. I joined the Sustainable Investment Group (SIG) at UC San Diego, where I now lead ESG research as Director of Project Management. I’ve built proprietary ESG frameworks, developed a greenwashing screening tool, and guided students in analyzing the sustainability performance and financial strategy of major corporations. This work allows me to explore how companies can operate more ethically—not just by complying with policy, but by embedding sustainability into their core operations.

My path hasn’t been linear, but every part of it informs the kind of analyst I am. My background in neuroscience gives me systems-level thinking and a deep understanding of human behavior—particularly useful when examining the psychology of the climate crisis. My passion for constitutional law and legal analysis, honed through years of competitive moot court, has made me a sharp, structured thinker; I’ve won multiple titles for my ability to craft persuasive legal arguments and dissect complex regulatory frameworks. And my experience in environmental activism taught me how to work with diverse stakeholders, build consensus, and translate abstract goals into real-world impact.

Sustainability sits at the intersection of everything I care about—environmental justice, ethical governance, behavioral insight, and analytical rigor. I’m excited to be building a career where I can bring these strengths together to help businesses become more transparent, accountable, and sustainable.