Fractional / vCISO
Own the program end to end: strategy, roadmap, budget, team and incident leadership. Board, investor and LP reporting that reads like it came from inside the business.
Fractional CISO · Security innovation · Founder advisory
Security leadership from someone who has carried the pager — for the firms that need it and the founders building what comes next.
Over twenty years running security inside financial services. Now available as your CISO, your guide to the security technology worth adopting, and your practitioner sounding board on the way to market.
20+
years leading security in financial services
CISO
at an institutional investment office
0 → 1
security functions built from scratch
Co-founder
FS-ISAC Alternative Investors Council
For firms
A seasoned CISO, sized to where you are.
For hedge funds, asset managers, fintechs and growth-stage companies that need senior security judgment — and a regulator-ready program — without a full-time executive hire.
Regulatory readiness
SEC, FINRA, NYDFS Part 500, SOX and FFIEC expectations translated into controls, evidence and policies that hold up in an exam or an operational due diligence review.
Security innovation
Access to vetted, next-generation security technology before it's mainstream — matched to your actual problems, piloted with discipline, and deployed without vendor theater.
AI governance
Practical guardrails for adopting AI tools and agents: data exposure, model and vendor risk, acceptable-use policy and the controls regulators will ask about.
Third-party risk
A vendor and service-provider risk program proportionate to your size — tiering, due diligence, contract terms and ongoing monitoring.
Build from zero
Launching a fund or scaling past your first security hire? Stand up the function, architecture and first team — then hand it to a full-time leader when you're ready.
How engagements work
01 — Assess
A clear-eyed baseline
A fixed-scope review of your risks, controls and regulatory posture, ending in a prioritized roadmap you can take to leadership.
02 — Lead
Ongoing CISO coverage
A monthly retainer with defined hours, a standing cadence with leadership, and on-call support when something goes wrong.
03 — Transition
Hand off with confidence
When it's time for a full-time leader, help define the role, interview candidates and transfer the program cleanly.
For cybersecurity founders
Build for the buyer by working with one.
I've been the first design partner, the first enterprise customer and an early investor. I know what makes a CISO take the meeting, run the pilot and sign the PO — and what makes them stop answering.
Advisor and angel investor to early-stage companies building the next generation of security and AI.
Companies I advise
Native Security
Daylight Security
About
Israel Bryski
A security executive with over twenty years inside financial services — from engineering and regulatory remediation at bulge-bracket banks to building and leading security programs at investment firms.
Why Bitahon? בִּטָּחוֹן is the modern Hebrew word for security. Its older, deeper meaning is trust — the confidence that what you rely on will hold. That's the standard this practice is built to.
- Chief Information Security OfficerMIO Partners (McKinsey's investment office)
- Director of Information Security — built the functionEton Park Capital Management
- VP, Senior Engineer — regulatory remediationGoldman Sachs
- Earlier security rolesMorgan Stanley · Nomura · TD Securities
- Co-founderFS-ISAC Alternative Investors Council
Let's talk.
Whether you need a CISO next month or a practitioner's read on your product, start with a 30-minute conversation.
Start with a 30-minute call
Tell me whether you're a firm looking for CISO coverage, exploring new security technology, or a founder building a company — and what's on your mind.