Alex, who holds the role of Managing Director, plays a pivotal role as your initial point of contact for a wide array of our valued clients. He is dedicated to ensuring that you experience a seamless and comprehensive service, all conveniently accessible under one roof. Alex’s commitment to professionalism and excellence is a driving force behind our client-centric approach.

Mark has over 15 years of management experience in engineering, operations, business administration, and process improvement. He holds an MEng in Chemical Engineering from the University of Nottingham, an Executive MBA from Kingston University, and is a Chartered Chemical Engineer (IChemE).

Since joining AES Sustainability in 2022, he has helped shape its operational framework, leading key projects like data migration to SharePoint and Oracle NetSuite implementation.

With experience across multiple industries, he excels in team management and financial planning, driving productivity and fostering collaboration to support AES' long-term growth.

Fun Fact: Mark is a keen runner and enjoys taking part in half marathons.

Since joining AES in 2012 as a trainee air tightness engineer, Stewart has gained invaluable experience, becoming a respected leader in the Compliance & Testing team.

He holds ATTMA accreditations for Level 1, 2, and 4 (low energy) air tightness testing and ventilation commissioning qualifications with ATTMA and Elmhurst.

Passionate about mentorship, he drives success within his team while maintaining high standards. Outside of work, Stewart has a busy home life with five children and numerous pets, often serving as the family taxi for rugby, football, and swimming events.

Fact Fact: When he’s not managing a team or a household, Stewart is behind the decks - so if you’re at a party, be sure to check the DJ booth,

Since joining AES in 2014, Andrew has driven industry best practices through research, thought leadership, and client engagement. His expertise in SAP methodology enables cost-effective, high-performance energy solutions from early design stages.

A BREEAM AP, Home Quality Mark assessor, and PassivHaus Consultant, he champions sustainability and innovation. He collaborates with technology teams to enhance services and supports AES’s consultancy team through training and guidance.

Passionate about low-carbon solutions, Andrew is committed to helping clients navigate the evolving landscape of sustainable development.

Claire is an Associate Director at AES, specialising in energy-efficient building services and renewable technology integration across a diverse range of projects, leveraging her extensive expertise to deliver sustainable and cost-effective solutions. Claire’s expertise extends to both non-domestic and domestic markets.

Crystal is an Associate Director at AES, specialising in sustainability and environmental design across a diverse range of projects, leveraging her extensive expertise in BREEAM and effective collaboration to deliver exceptional and sustainable outcomes.

Mitchell specialises in residential buildings, leading our SAP and Psi Value delivery. Being a long serving consultant at AES he has built up over a decade of experience working towards meeting Part L compliance and beyond for numerous developments of all shapes and sizes.

Silvio has over 25 years of experience in the building industry, working on-site and in architectural and engineering offices. He holds a Civil Engineering degree from Germany and a Master’s in Energy, Sustainability, and Environment from the University of Southampton.

Since joining AES Sustainability in 2011, he has advised top UK developers and contributed to Zero Carbon Hub DvAB projects.

He has driven innovation at AES, leading to the launch of the AES HUB and SiteView software. The AES HUB won ‘Best Business Product’ at the Housebuilder Product Awards 2024, highlighting AES Sustainability’s commitment to industry-leading solutions.

Fun Fact: Silvio cannot stand still, even when sleeping!

Anna Farmer is the Governance Manager at AES, ensuring the organisation adheres to regulations, policies, and best practices, overseeing risk management, compliance, and corporate governance frameworks.

Fun Fact: Anna spends her spare time helping on her parents' farm so she's a dab hand at lambing!

Greg loves to meet new people and acts as our liaison between clients, engineers and consultants. He moved across from our sister company where he was an integral part of the AES Compliance & Testing (Formerly DALTEC) team for more than a decade, accumulating a wealth of on-site testing experience.

Fun Fact: Has also played at Twickenham and won! He's a keen Exeter Chiefs & England rugby supporter and loves cooking outside on the BBQ.

Carys is responsible for leading the People Services function and joined AES in October 2022.

Carys is diverse in HR experience across both the public and private sectors in a variety of roles, with a strong focus on employee relations, change management, recruitment and strategic HR. Carys has collaborated across organisations to develop policies, drive organisational change and provide expert people management advice, whilst always aiming to promote a positive workplace culture.

Fun Fact: Carys' first language is Welsh!

Having worked in finance with companies of all sizes for the last 35 years—from PLC to start-up, an FE college, as well as charities and clubs, including Help for Heroes—Julie has experience in a wide range of ‘business’ activities and financial reporting.

Implementing great financial controls to drive out the commercial aspirations of the owners of any business is always a key driver for Julie in any role, and the opportunity to help AES transition to a medium-sized organisation with a back office fit for at least five years of growth was the motivation for joining AES as Finance Director.

Fun Fact: Julie is a trained hypnotherapist and is a Norfolk ‘dumpling’ that loves dogs!

With 15 years of experience in the sustainability sector, Pete has driven business growth and delivered impactful solutions across the UK.

Since joining AES in July 2024, he has shaped business development strategy, secured high-value projects, and expanded market reach. Pete has led major decarbonisation and net zero projects, earning national recognition for his work.

His expertise in commercial strategy, client engagement, and leadership, combined with a collaborative approach, ensures AES’s continued success in delivering sustainable solutions and fostering a high-performance sales culture.

Fun Fact: Pete is a keen cyclist who gets out on his bike whenever he can. He’s also a music obsessive and loves travelling across the country to attend as many gigs as possible!