Sean O'Sullivan, MCIIS

Commander
DISC Type : D

Cyber Security Manager, UK at AESC UK

Gateshead, England, United Kingdom

Overview

Sean OSullivan is a Cyber Security Manager at AESC UK with 19 years of experience, specializing in security frameworks like ISO 27001 and leading vulnerability management programs. Described by colleagues as dedicated, knowledgeable, and collaborative, he is a Full Member of the Chartered Institute of Information Security (CIISEC).

Beyond his cybersecurity career, Sean is a writer, hobbyist developer, and a trained Mental Health First Aider. He lives in the North East of England with his wife and two children, and enjoys good coffee, writing, and developing his own applications, including Centro 365 and Markdown Clips.

In addition to his main cyber security role, Sean develops and maintains Centro 365, a popular browser extension and mobile app for managing Microsoft 365.

Personality Overview

Risk-Taker

Impact-Driven

Very Quick

They take a lot of pride in personal achievements.  More than the product, they care about the impact of the product. They are not always relationship oriented.

Topics They Care About

Cybersecurity Leadership
With 19 years of experience, he leads all cyber initiatives for AESC UK and has a track record of mentoring and building security functions from the ground up.
Cloud Security
He has authored articles on the importance of securing multi-cloud environments, focusing on identity management, supplier reviews, and user education to protect data.
AI in Security
Actively engages with emerging technologies by participating in professional roundtables to have frank and open discussions about AI's role in the industry.

Media Appearances

Sean has no verified media appearances

Work History

6-2025
Cyber Security Manager, UK at AESC UK
9-2022 - 6-2025
Cyber Risk Manager at Pulsant
4-2021 - 9-2022
Head of Information Technology at Cintra HR & Payroll Services
2-2013 - 4-2021
ICT Manager at Cintra HR & Payroll Services
9-2006 - 2-2013
IT Technician at Cintra HR & Payroll Services

Education

2003 - 2006
Information Technology from Newcastle College

More Information

Social Presence :

Prographics :

Exp : 19 Location : Gateshead, England, United Kingdom Job Level : Middle Designation : Cyber Security Manager, UK at AESC UK
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Insights For Selling To Sean

During A Call Or A Meeting

DO's

  • Hold your ground without indulging in one-upmanship
  • When negotiating terms, help them build an impression that they are the ones calling the shots
  • Speak about competitive differentiation that your product offers

DONT's

  • Do not hesitate from asking counter questions, just avoid challenging their authority
  • Don’t take too much time in sending them information if they ask for any
  • Do not spend too much time focusing on product tech or features

When Cold Calling

When Writing An Email

While Negotiating & Closing

    The secret to closing fast with Sean is

  • Conviction around the impact matters the most to them, followed by a sense of achievement and ROI.
  • Will you ever get a clear answer from Sean

  • If they are not convinced, they will say no without any hesitation.

Insights For Deal Planning

    How fast (or slow) will Sean move?

  • They can reach decisions fairly quickly if they are convinced.
  • Can Sean take some risk or not?

  • They don’t mind risks but can be quite binary about them.

You And Sean

Personality Compatibility


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