David Lissah

Chartered Manager & Management Mentor 
Business Owner | Brand Ambassador | IIRSM Vice Chair - Ireland & International Committee Member for Northern Ireland
A Journey of Leadership Growth
Starting his management journey on the shop floor in the early 90s, David Lissah climbed the corporate ladder into senior leadership roles, gaining first-hand experience of what it takes to lead at every level. Qualified to Master's level in Strategic Management & Leadership, his career has spanned diverse environments, including military, facilities management, and engineering. This gives him a unique perspective on leadership, risk, and resilience.
1
Shop Floor Technical Specialist
Early 1990s: Building fundamental leadership skills through hands-on experience and understanding operational challenges.
2
Middle Management
Development of team leadership capabilities and strategic insight whilst implementing organisational initiatives.
3
Senior Leadership & Board Member
Advanced strategic oversight with responsibility for large teams and substantial operational budgets.
Local Impact & Global Vision
As a Partner at Lissah & Boyle, David leads a fractional business support team that helps business owners, executives, and managers overcome the real-world challenges that hold back performance. Many already have the talent and technical skills, they just don't have the time, resources, or capacity. That’s where David comes in. 
Whether it’s mentoring and unlocking productivity challenges for managers on the shop floor or as an accountability partner for executives, delivering on their strategic aims, David helps clients transform operational friction into focused execution.
As Vice-Chair of IIRSM Ireland and Committee Representative for Northern Ireland, David's mission is to equip managers globally with the tools, resources, and support they need to build safe, engaged, and resilient teams.
 
Leadership Scale and Impact
David's leadership capabilities have been proven through his career and exceptional team and resource management across diverse organisational contexts. Including:
132
Team Size
Successfully led teams of up to 132 personnel across diverse operational environments.
£10.5M
Budget Managed
Leadership responsibility for substantial operational budget allocation and optimisation of up to £10.5 million.
£150M
Project Scale
Contributed expertise on projects from minor works <£1million to major capital schemes of circa £150 million.
£1Billion
Property Portfolio
Operational responsibility for regulatory compliance across large property portfolios valued up to £1Billion, from administration offices to Cat 3 UK Home Office Licenced Research Laboratories. 
Current Roles
Partner
Lissah & Boyle
Apr 2025 to Present
Providing tailored mentoring for technical professionals and hands-on support for small businesses to strengthen their leadership and management capabilities, covering everything from management development to strategy implementation. 
IIRSM Ireland Vice-Chair
IIRSM Ireland Branch
Sep 2024 to Present
As Vice-Chair, my role acts as a bridge, connecting IIRSM’s strategic ambitions across UK, Ireland, Europe and the Middle East with the lived experiences of our members. I advocate for leadership that is inclusive, practical, and rooted in real-world decision-making.
Life Outside of Business
When David is not working with small business owners or mentoring future leaders, you’ll most likely find him with a canine friend by his side. He is a passionate dog lover and proud canine foster carer, providing temporary homes and a bit of extra love to dogs in need.
These moments away from the desk are the things that recharge David, keep him grounded, and a reminder why empathy and resilience matter just as much in life as they do in business.
Professional Licences & Accreditations
Accredited Strengths Coach
Change Management Practitioner
Chartered Manager
Official IIRSM Partner
©2025 Lissah & Boyle | 📞 Call/Text: 0203 576 0081 / 07709 115948 | 📧 Email: Hello@lissahandboyle.co.uk 