# Macgregor Duncan

> Macgregor Duncan is the Sydney-based co-founder and co-CEO of Constantinople, a software and operations platform for banks founded with Dianne Challenor in 2022. A former Westpac Chief Development Officer, he previously worked in law, investment banking, electric-vehicle infrastructure and private equity. He also co-authored the 2004 book Imagining Australia: Ideas for Our Future.

- **Role:** Co-Founder & Co-CEO at Constantinople
- **Organizations:** Constantinople, Westpac, Goldman Sachs, Better Place, Debevoise & Plimpton, High Court of Australia
- **Nationality:** Australian
- **Education:** Politics and Law, First Class Honours, University of Adelaide, Master of Public Affairs, Princeton University, School of Public and International Affairs, Master of Laws, Harvard Law School
- **Known for:** Co-founded Constantinople and secured backing from Square Peg, Airtree, Great Southern Bank and Prosus Ventures., Helped launch Westpac’s digital bank., Co-authored Imagining Australia: Ideas for Our Future, published by Allen & Unwin in 2004.

## Career timeline

- **1998** — Graduated from the University of Adelaide; began his career as associate to Justice Michael Kirby at the High Court of Australia.
- **2004** — Co-authored Imagining Australia: Ideas for Our Future with Andrew Leigh, David Madden and Peter Tynan while working as a lawyer in New York.
- **Before 2016** — Worked at Debevoise & Plimpton and Goldman Sachs, led global corporate development at Better Place, and became a managing director in New York private equity.
- **2016** — Joined Westpac in September; his roles included corporate and business development and subsequently Chief Development Officer.
- **2022** — Co-founded Constantinople with Dianne Challenor.
- **2023** — Constantinople publicly launched with an announced A$32 million seed round.
- **2024** — Constantinople raised an A$50 million Series A led by Prosus Ventures; Great Southern Bank’s business bank was live on the platform.
- **2026** — Announced the migration of MoveBank’s full banking operation to Constantinople.

## Achievements

- Co-founded Constantinople and secured backing from Square Peg, Airtree, Great Southern Bank and Prosus Ventures.
- Helped launch Westpac’s digital bank.
- Co-authored Imagining Australia: Ideas for Our Future, published by Allen & Unwin in 2004.
- Co-led Constantinople through its first full retail-bank migration, MoveBank, announced in August 2026.

## Latest updates

- **2026-01** — Published essays arguing for shared banking platforms and explaining the data, decision context and execution controls he believes banking AI requires.
- **2026-08** — Published Introducing Constantinople: The fabric for banking’s AI era and announced MoveBank’s migration. He said MoveBank was reducing its cost-to-income ratio by over 30%; this is a company-reported claim.
- **2026-09** — Capital Brief covered Constantinople’s MoveBank migration and ambitions for international expansion.

## Links

- Website: https://www.cxnpl.com/
- LinkedIn: https://www.linkedin.com/in/macgregor-duncan-bb0381179/

---

Profile page: https://yespress.io/macgregor-duncan
Published by YesPress — https://yespress.io
Last updated: 2026-10-21