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.

Our Mission

Why Sirmium Capital Exists

The communities we serve — 9/11 families, FDNY, NYPD, veterans, nurses, NPs & PAs, and physicians — 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 403(b) optimization. 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.

"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, Founder & Chief Investment Officer, Sirmium Capital

Fee-Only

Fiduciary Standard

Independent

Fiduciary

Niche Communities

Commissions or Conflicts

Founder & Chief Investment Officer

William Harrison

William Harrison is Sirmium Capital's Founder and Chief Investment Officer. 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

VP, Head of Marketing

Eslyn Hernandez

Eslyn Hernandez is Sirmium Capital's 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, veterans, nurses, NPs & PAs, and physicians.

He knows these communities and the financial questions they actually face — from USVSST awards for 9/11 families to FDNY and NYPD pensions, TSP rollovers, nurse 403(b) fees, NP/PA 1099 income, and physician tax planning. That fluency shapes how Sirmium tells its story and meets each community in its own language.

A New Yorker and financial-literacy advocate, Eslyn also supports NYC Honor, a nonprofit bringing NIL financial-education programs to youth athletes. 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, 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