Emma Lancaster
Chief Executive
Meet the Senior Leadership TeamGOING AABOVE & BEYOND TOGETHER.
We are AAB, a leading professional services firm across the UK, Ireland, and USA serving the mid-market. We think beyond and strive to be your first port of call in all your business decisions. Our goal is to be your most trusted business advisor.
Our Leaders
Meet the leaders driving our services and sectors across AAB.
Alasdair Green
ESG Partner
Meet the Sustainable Business & ESG Team
Lauren McCluskey
Head of Office of the CFO
Meet the Office of the CFO Team
David Purse
Head of Payroll and Employment Taxes
Meet the Payroll & Employment Team
Derek Mitchell
Executive Director
Meet the Senior Leadership Team
Gary Harding
Head Of Audit
Meet the Audit & Assurance Team
Gordon Steele
Head of Corporate Finance
Meet the Corporate Finance Team
Graeme Allan
Group Executive Director
Meet the Senior Leadership Team
Ian Bremner
Hotel Accounting Partner
Meet the Hotel Accounting Team
John Beevers
Head of Regions
Meet the Senior Leadership Team
Jonathon Grainger
Chief Operating Officer
Meet the Senior Leadership Team
Louise McCosh
Head of People Team & Partner
Meet the People Team
What Clients Value Most
Working with AAB means partnering with a team driven by innovation, responsiveness, and a genuine commitment to continuous improvement.
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AAB are more than accountants; they’re trusted partners. At Blaze Manufacturing Solutions Ltd, we’ve experienced significant growth, and AAB ensures we receive the right advice to meet our changing needs. Their guidance supports the aspirations of both our management and team, helping us stay on track as we scale.
Blaze Manufacturing Solutions Ltd – Accounting Services Ann Johnson - Finance Director
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We appreciate the invaluable support provided by AAB during our complex transition. With limited resources, AAB quickly mobilised experienced personnel familiar with offshore payroll, expense systems, and time writing processes. Their expertise ensured a smooth handover, and the process felt routine during the first post-completion month. AAB’s support was instrumental in ensuring a seamless transition.
Andy Bell, VP Finance, Serica Energy
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The team have a commercial approach that adds value beyond the standard scope of services, we also benefited greatly from being able to draw on the technical knowledge and industry expertise within the wider AAB Group.
Ben Leslie, Puma Private Equity
Driving Progress in Business & Community
Our sponsorships span industry events and meaningful community initiatives — reflecting our commitment to progress both in the markets we serve and the places we live and work. It’s all part of being a connected, responsible, and forward-thinking partner to our clients.
1002+
Team Members
80+
Countries
14
Offices
12
Service Lines
1 Focus
You.
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Our Awards
View our blogs
Fresh thinking, practical advice, and real-world insights from our experts.
Blog
16 July 2026
- Tax
Senior accounting officer: the essential guide to HMRC compliance
As businesses grow in size and complexity, HMRC’s compliance expectations go beyond the accuracy of tax…
Blog
16 July 2026
- Sustainable Business & ESG
What the new IFRS Sustainability Standards mean for SECR
The UK adopted the IFRS (International Financial Reporting Standards) Sustainability Standards in February 2026, paving the way for future changes to sustainability-related disclosures. Available…
Blog
14 July 2026
Charities SORP 2026: Trustee Annual Report compliance
With the Charities SORP 2026 finally upon us, organisations across the country are still getting to grips…
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