Mark Trexler

Methodology focus

Founder of Climatographer; designed the first voluntary carbon offset project in 1988 (Applied Energy Services / CARE Guatemala). Three decades of carbon market experience spanning industry, EPA advisory roles, and the Climate Web knowledge-base project. Most credible 'elder statesman' critic of the field.

Trellison / LedgerWell intersection. Historical credibility. Has seen every failure mode.

Affiliation

Climatographer

Role

Founder

Axis

Integrity Critics

Tier

Tier 1

Selected publications

2020-2026 — Climatographer knowledge base on carbon offset history and quality. The Climate Web.
Various — Op-eds and commentary in GreenBiz, Bloomberg, and industry press. multiple venues.

Alignment with proof packs

Their methodology / role	Proof-pack / Trellison fit
Historical knowledge of offset methodology failures	Proof pack formalises the specific failure modes he has catalogued for 30+ years
Practitioner-credible framing	Trexler's endorsement of a methodology signals to the older industry cohort

Collaboration concepts

Concept 1

Historical taxonomy of offset failure modes, operationalised as proof-pack negative checks

Collaborative publication turning Climatographer's failure catalogue into a proof-pack rule set.

Concept 2

Industry practitioner briefing series

Trellison-hosted webinar series with Trexler on 'how markets failed, and what a per-tonne evidentiary chain fixes.'

Concept 3

Advisory role on Trellison methodology board

Senior advisor position with compensated honorarium and full disclosure.

Outreach approach

Proposed opening message

Subject: A reference implementation for your integrity thesis

Dear Mark Trexler,

We have been reading your published critique of carbon market integrity as a design specification rather than commentary. Trellison Institute has been building a per-tonne open-data verification instrument — we call the artefact a proof pack — that tries to implement what your work argues for.

I would welcome a 30-minute conversation to show you the current alpha. We are not asking for endorsement; we are asking for methodology critique and, if useful, an offer of alpha access for your active work. Independent negative evaluations would be published alongside positive ones.

A one-page methodology brief that maps your work to proof-pack schema fields — with gaps flagged honestly — is attached.

With respect,
Rob Stillwell
Director, Trellison Institute

What we do not ask for

Endorsement of Trellison, LedgerWell, DaedArch, or any affiliated entity.
Exclusivity or first-look rights on research findings.
Unpaid labour. Any advisor role is compensated with a modest honorarium and disclosed on the record.

Disclosure: Compiled from public sources through April 2026. Inclusion does not imply endorsement, affiliation, or reciprocal interest. Corrections: About.

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