John Harley Breen
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John Harley Breen Email & Phone Number

Geopolitics and Strategy @ Sibylline Ltd at Sibylline Ltd
Location: Dublin, County Dublin, Ireland 12 work roles 2 schools
1 work email found @sibylline.co.uk LinkedIn matched
✓ Verified May 2026 4 data sources Profile completeness 100%

Contact Signals · 1 work email

Work email j****@sibylline.co.uk
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Current company
Sibylline Ltd
Role
Geopolitics and Strategy @ Sibylline Ltd
Location
Dublin, County Dublin, Ireland
Company size
68 employees

Who is John Harley Breen? Overview

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Quick answer

John Harley Breen is listed as Geopolitics and Strategy @ Sibylline Ltd at Sibylline Ltd, a company with 68 employees, based in Dublin, County Dublin, Ireland. AeroLeads shows a work email signal at sibylline.co.uk and a matched LinkedIn profile for John Harley Breen.

John Harley Breen previously worked as Consulting Manager at Sibylline Ltd and Lead Consultant at Sibylline Ltd. John Harley Breen holds Master’S Degree from Queen Mary University Of London.

Company email context

Email format at Sibylline Ltd

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{first_initial}{last}@sibylline.co.uk
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AeroLeads found 1 current-domain work email signal for John Harley Breen. Compare company email patterns before reaching out.

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Profile bio

About John Harley Breen

As consulting manager at Sibylline, I help clients manage geopolitical risks with confidence and insight. My role involves enhancing client resilience, leading and supporting Sibylline’s consultants and analysts, driving business development, and strengthening client relationships. I am a pragmatic and insightful leader who promotes integrity, staff development, and knowledge-sharing. This blend of collaboration, business development, and analytical insight has been pivotal throughout my career, delivering strategic advice and innovative solutions that enable decision-makers to navigate complex political and geopolitical landscapes.

Listed skills include International Relations, Foreign Policy, Human Rights, Policy Analysis, and 45 others.

Current workplace

John Harley Breen's current company

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Sibylline Ltd
Sibylline Ltd
Geopolitics and Strategy @ Sibylline Ltd
london, greater london, united kingdom
Website
sibylline.co.uk
Employees
68
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Company profile
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12 roles

John Harley Breen work experience

A career timeline built from the work history available for this profile.

Consulting Manager

Current
Sibylline Ltd

Dublin, County Dublin, Ireland

Oct 2023 - Present

Lead Consultant

Sibylline Ltd

Dublin, County Dublin, Ireland

Jun 2021 - Oct 2023

Lead Analyst, Geopolitical Risk

Sibylline Ltd

Dublin, County Dublin, Ireland

Dec 2020 - Dec 2021

Intelligence Analyst

Sibylline Ltd

Dublin, County Dublin, Ireland

May 2020 - Nov 2020

Foreign Policy Consultant

Freelance

Dublin, County Dublin, Ireland

Jan 2020 - May 2023

Political Analyst

Freelance

London, United Kingdom

Oct 2016 - Mar 2017

Advocacy Consultant

Cambodian League For The Promotion And Defense Of Human Rights (Licadho)

Cambodia

Jul 2014 - Apr 2015

Radio Producer And Researcher

Communicorp Uk

Dublin, Ireland

Jul 2010 - Aug 2012
Team & coworkers

Colleagues at Sibylline Ltd

Other employees you can reach at sibylline.co.uk. View company contacts for 68 employees →

SA Scott Allen, Cpp Scott Allen, Cpp Colleague at Sibylline Ltd San Francisco, California, United States, United States View → ML Mathilde Loubeyres Mathilde Loubeyres Colleague at Sibylline Ltd Paris, Île-de-France, France, France View → CO Courtney O'Toole Courtney O'Toole Colleague at Sibylline Ltd Tacoma, Washington, United States, United States View → AQ Aaron Qiao Aaron Qiao Colleague at Sibylline Ltd Washington, District Of Columbia, United States, United States View → CA Charles Adinuba Charles Adinuba Colleague at Sibylline Ltd Washington DC-Baltimore Area, United States View → EI Emmanuel Igbinoba Emmanuel Igbinoba Colleague at Sibylline Ltd United Kingdom, United Kingdom View → IB Isla Brown Isla Brown Colleague at Sibylline Ltd United Kingdom, United Kingdom View → EJ Emily Jackson Emily Jackson Colleague at Sibylline Ltd Alexandria, Virginia, United States, United States View → PE Pelin Eralp Pelin Eralp Colleague at Sibylline Ltd Seattle, Washington, United States, United States View → PN Philip Nguyen Philip Nguyen Colleague at Sibylline Ltd Bothell, Washington, United States, United States View →
2 education records

John Harley Breen education

FAQ

Frequently asked questions about John Harley Breen

Quick answers generated from the profile data available on this page.

What company does John Harley Breen work for?

John Harley Breen works for Sibylline Ltd.

What is John Harley Breen's role at Sibylline Ltd?

John Harley Breen is listed as Geopolitics and Strategy @ Sibylline Ltd at Sibylline Ltd.

What is John Harley Breen's email address?

AeroLeads has found 1 work email signal at @sibylline.co.uk for John Harley Breen at Sibylline Ltd.

Where is John Harley Breen based?

John Harley Breen is based in Dublin, County Dublin, Ireland while working with Sibylline Ltd.

What companies has John Harley Breen worked for?

John Harley Breen has worked for Sibylline Ltd, Freelance, Permanent Mission Of Ireland To The United Nations, The London School Of Economics And Political Science (Lse), and Independent Diplomat.

Who are John Harley Breen's colleagues at Sibylline Ltd?

John Harley Breen's colleagues at Sibylline Ltd include Scott Allen, Cpp, Mathilde Loubeyres, Courtney O'Toole, Aaron Qiao, and Charles Adinuba.

How can I contact John Harley Breen?

You can use AeroLeads to view verified contact signals for John Harley Breen at Sibylline Ltd, including work email, phone, and LinkedIn data when available.

What schools did John Harley Breen attend?

John Harley Breen holds Master’S Degree from Queen Mary University Of London.

What skills is John Harley Breen known for?

John Harley Breen is listed with skills including International Relations, Foreign Policy, Human Rights, Policy Analysis, Capacity Building, Public Policy, Diplomacy, and Foreign Policy Analysis.

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