Our Team

The People Behind Your Fiduciary

Deep niche expertise. One shared mission: to give the communities that served New York investment guidance they can trust absolutely.

The principle that guides everything we do

"The best thing a human being can do is to help another human being know more."

— Charlie Munger

This idea shapes how we work. We teach first, and everything we build is meant to help the communities we serve understand their own money.

Our Mission

Why Sirmium Capital Exists

The communities we serve (9/11 families, FDNY, NYPD, and veterans) face financial complexities most advisors have never studied.

NYPD and FDNY pension optimization is different from TSP rollover strategy. USVSST award management is different from 457(b) planning. The laws, benefits, tax rules, and planning opportunities are entirely specific to each community.

Sirmium Capital was built to fill that gap. We serve as your fee-only fiduciary adviser, legally bound to act in your best interest, with deep expertise in the financial systems that govern your life. Structure matters more than the disclaimer, because disclosing a conflict does not cancel it: the Coin Jar Test walks through the research on what disclosure actually does.

"The communities we serve don't need a generalist. They need someone who has studied their pension, their benefits, and their tax treatment in depth. That's what we've built."

— William Harrison, Co-Founder & Chief Investment Officer, Sirmium Capital

Fee-Only

Fiduciary Standard

Independent

Fiduciary

Niche Communities

Commissions or Conflicts

Our Story

Why We Built Sirmium Capital

Sirmium Capital began with two people whose lives were shaped by service and sacrifice. Eslyn lost his mother and aunt on September 11th. William graduated from West Point and served in the U.S. Army. Years later, our paths crossed on Wall Street, where we built careers in finance and investing.

Over time, we realized we could put that experience to work for the communities we came from. 9/11 families, first responders, and veterans shouldn't have to navigate some of the most consequential financial decisions of their lives with an adviser learning their world as they go.

We built Sirmium to combine Wall Street experience with a personal understanding of the people we serve. That is still our ethos today: serve the communities that shaped us, and put their interests first.

Co-Founder & Chief Investment Officer

William Harrison

William Harrison is a Co-Founder and the Chief Investment Officer of Sirmium Capital. He oversees the firm's investment process, portfolio construction, and publishes the quarterly Inside the Portfolio research letter.

His investment philosophy is rooted in the Buffett/Munger tradition: concentrated positions in high-quality businesses at reasonable prices, held with patience and conviction. He focuses on long-term capital allocation, business quality analysis, and understanding the competitive dynamics that drive durable returns.

William's quarterly research letter is available free to all Sirmium Capital clients and newsletter subscribers, providing transparent insight into the firm's thinking and investment rationale.

Read William's Research Subscribe to the Letter

Co-Founder & VP, Head of Marketing

Eslyn Hernandez

Eslyn Hernandez is a Co-Founder of Sirmium Capital and its VP, Head of Marketing, focused on reaching and serving the niche communities at the heart of the firm's work: 9/11 families, FDNY, NYPD, and veterans.

He knows these communities and the financial questions they actually face, from USVSST awards for 9/11 families to FDNY and NYPD pensions, and TSP rollovers for veterans. That fluency shapes how Sirmium tells its story and meets each community in its own language.

A New Yorker and financial-literacy advocate. Sirmium Capital is the founding sponsor of the NYC Honor Foundation, a 501(c)(3) pairing elite youth basketball with financial literacy and NIL education, and the firm's professionals teach its financial curriculum pro bono. He is committed to expanding access to quality financial education for communities that have historically been underserved by the financial industry.

Book a Free 15-Min Call See Who We Serve

Eslyn Hernandez, Co-Founder and VP, Head of Marketing at Sirmium Capital

Our Commitment

The Fiduciary Standard Explained

As a Registered Investment Adviser, Sirmium Capital is legally bound by the fiduciary standard, the highest legal duty in financial services. Here's what that means for you.

We Put You First

Every recommendation we make is legally required to be in your best interest, not driven by sales goals, product incentives, or institutional pressure. That's the fiduciary standard.

No Commissions. Ever.

Fee-only means we're paid directly by clients, never by product manufacturers, fund companies, or referral arrangements. What we earn has nothing to do with what we recommend.

Independent Oversight

We are not affiliated with any bank, brokerage, or fund company. Our only institutional obligation is to our clients. We choose what's right for your situation, not what's approved by a home office.

Work With Us

Ready for a Fiduciary Adviser Who Knows Your Community?

A free 15-minute call. No pressure, just a straight conversation about your situation and whether we're the right fit.

Book a Free 15-Min Call