DISCLAIMER: This is entirely fictional content. GreyFern, all people, clients, tooling, and engagements described herein are fictional and were created for runhacks.sh, an interactive cybersecurity training platform. Nothing on this site represents a real organization, person, or event. Any resemblance to real entities or individuals is coincidental and unintentional.

People

Small, senior, and quiet.

GreyFern keeps a deliberately low public profile. We publish no operator headshots — the same discretion we apply to a client engagement, we apply to ourselves. Below are the people who lead the firm and shape its craft.

Executive

Iris Calloway
Founder & Principal
Executive

Ex-red-team operator who walked out of a reckless shop and founded GreyFern on the principle that scope is sacred. Owns tradecraft and vision, sets the doctrine every operator is drilled on, and decides which work the firm takes — turning down more engagements than she accepts.

Reports to

Leadership

Four functions, direct to the principal.

Alan Voss
Co-Founder & Head of Tradecraft & Assurance
Tradecraft & Assurance

The authorization conscience of the firm. Author and enforcer of the Frond Doctrine; owns rules of engagement and the signed-scope discipline that keeps GreyFern legal and clean.

Reports to Iris Calloway
avoss@greyfern.dev
M. Rendrick
Lead Operator / Engagement Lead
Operations · Handler

Warm-but-exacting lead operator who runs live engagements end to end and breaks in new hires on their shakeout. Points at what's missing, never at how to find it. Learning how to look is the entire point.

Reports to Iris Calloway
rendrick@greyfern.dev
Sable Okonkwo
Head of Intelligence (OSINT/CTI)
Intelligence

Runs OSINT and competitive-intelligence collection. Treats source disagreement as the finding and wrote the house method around cross-referencing every source against every other.

Reports to Iris Calloway
sokonkwo@greyfern.dev
Coralie Mercier
Head of Client Engagements
Client & Business Office

Owns client relationships and engagement scoping. The person who turns a client's vague anxiety into a bounded engagement — and the one who says no to work that can't be done inside the lines.

Reports to Iris Calloway
cmercier@greyfern.dev

Analysts & platform

Devin Ashcroft
Tooling & Platform Lead
Tradecraft & Assurance

Builds and maintains the internal toolchain — FROND, SPORE, UNDERSTORY, DRYAD — that operators live inside. His design principle, baked into FROND: contradiction is signal.

Reports to Alan Voss
dashcroft@greyfern.dev
Wren Halloran
Senior CTI Analyst, Due Diligence
Intelligence

Pre-acquisition and third-party-risk research specialist. Assembles decision-grade pictures of who a client is really dealing with — and never trusts the first record she finds.

Reports to Sable Okonkwo
whalloran@greyfern.dev
Henry Osei
Engagement Coordinator
Client & Business Office

Coordinates authorization letters, scheduling, and evidence handling — the operational glue between the client office and the operators. Nothing goes live until his paperwork is clean.

Reports to Coralie Mercier
hosei@greyfern.dev

Some of our operators are not listed here. A low-profile firm keeps some of its people off the record — by design, and in their interest. Individual operator profiles are held internally and are not published externally.

Work with the people who choose the paperwork.

Every engagement is scoped by our client office and run by an operator held to a doctrine the whole firm shares.

Discuss an engagement