Curious · Courageous · Concrete

Grounded leadership for your next transformation

I lead change that helps people and organisations grow — curious, courageous and concrete.

I am an AI practitioner: I run my own AI operating model every day.

Martin Kallenbach by the water in Helsinki

€320M · 2,500 FTE

Shared Services restructured, about 10% cost reduction

$40M+ ACV · 500+ FTE

Engagement turned around, CIO trust rebuilt in 6–12 months

€50M p.a.

SIAM operating model built at HCL

New series · from 19 October

Building my AI operating system

A preface and twelve posts, one every three days until 21 November: how I built the AI operating system I run every day — what worked, what broke, and the patterns I would reuse.

Start with the preface The whole series

What sets me apart

What I bring to the room

What I steer is rarely the technology; it’s the organisation and the people around it.

  1. Courage and trust in high-stakes rooms

    The deadlocks, the politics, the negotiations nobody wants to chair. I’ve been in them before, and I can steer them — building the trust that holds when the room is hard.

    Radical transparency — the true thing, said plainly, before you’re forced to.

  2. Capability that outlasts me

    I’m hired because the result has to survive the exit, not end with the engagement. I build the organisational muscle — and the people — that keep delivering once I’ve gone.

    Build the rescue muscle before the fire, not during it.

  3. Restructuring with humanity

    Hard outcomes — cost, org change, layoffs — delivered so the organisation survives and even thrives. A €320M restructuring, overachieved, the team intact and still motivated.

    Challenging people is caring for them — the tough talk, done fairly.

When to call

That’s my room

If any of these is happening to you right now, it’s the kind of situation I’ve steered before.

“Our HQ and our site or offshore teams can’t stand each other.”

Two groups that need each other and don’t trust each other — the divide I’ve bridged before.

“One person is quietly holding a critical account together.”

Continuity resting on someone doing two jobs unofficially — and you know it’s fragile.

“The person the client trusts isn’t the one with the budget.”

Trust and commercial authority split across people — a structural risk most miss until it’s late.

“The plan says cut them all, and something in me says that’s wrong.”

A restructuring where the humane call and the spreadsheet call aren’t the same.

Writing

Latest from the blog

Frameworks, pattern languages and honest reflections — a timeline of recent posts, oldest on the left, newest on the right.

All posts
  1. · Leadership

    Barrel Riding — When the Rough Plan Is the Only One That Fits

    Bilbo’s escape from the Elvenking’s halls is not elegant.

    Read 3 min

  2. · Leadership

    Sting Glows Blue — The Early Warnings Your Dashboards Don’t Show

    Bilbo’s sword Sting has one magical property: it glows blue when orcs are near. Not when they attack — when they approach.

    Read 3 min

  3. · Leadership

    The Burglar’s Role — Why Thorin Didn’t Hire a Fourteenth Dwarf

    There is a detail in The Hobbit that is easy to read past. Thorin’s company doesn’t recruit Bilbo despite him not being a dwarf.

    Read 3 min

  4. · Leadership

    The Arkenstone — The Treasure You Must Not Trade Away

    Under the Lonely Mountain lies a hoard beyond counting — gold, gems, mithril. And in the middle of it, one stone unlike the rest: the Arkenstone, the Heart of the Mountain.

    Read 3 min

  5. · Leadership

    The Lonely Mountain — Go-Live Is Not the End of the Story

    Here is a structural fact about The Hobbit that most readers forget: the company reaches the Lonely Mountain — the destination, the goal of the whole quest — with nearly a third of the book still to go.

    Read 4 min

  6. · Leadership

    There and Back Again — Bringing the Journey Home

    Bilbo’s own title for his memoirs was “There and Back Again.” Not “How I Helped Kill a Dragon.” The destination gets second billing; the return gets equal weight with the adventure.

    Read 4 min

  7. · Architecture Notes

    Why I am writing this

    I have spent a long career in IT, designing operating models and running transformations where systems and organisations meet. Since October 2025 I do that independently, with my own small company.

    Read 2 min

  8. · Architecture Notes

    Four inboxes, one vault — and an assistant inside it

    In January my day started with a checklist: clear the OneNote inbox, the OneDrive inbox, Google Drive, iCloud. Four places where notes, receipts and half-finished thoughts landed, all to be visited before I could think about anything else.

    Read 5 min

I build systems that help humans flourish.

A change that’s dangerous, and people you can’t afford to lose? That’s my room.

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