Quintessa was founded in 1999 with the aim of providing an enjoyable and fulfilling working environment in which talented scientists and mathematicians can use their problem solving skills to help clients address key issues. Quintessa operates at the interface between academia and industry, facilitating the application of leading-edge knowledge in a timely and cost-effective manner.

We celebrate the fact that our principal assets are talented individuals with leading edge expertise in their chosen fields and a passion for problem solving. Quintessa is an employee-owned company, and an active member of the Employee Ownership Association, where everyone is empowered to contribute to operational and strategic decisions. We are, and plan to remain, an SME (Small / Medium-sized Enterprise) focussed on providing high quality specialised services.

Our services cover decision support, geosciences, materials modelling, mathematics, risk assessment and software development together with the provision of customised training in all these areas. Currently our projects are primarily focussed on the safety and environmental consequences of nuclear power and carbon-based fuels. However, we are always keen to broaden our horizons to other technical challenges aimed at ensuring the sustainability of planet earth.

We are proud to work for some of the world’s leading science-based organisations and strive to build trusted partnerships with them in order to understand and address their needs. To achieve this, we embrace collaborative working with other organisations and individuals in order to provide the best possible solutions for our clients. Our success is evidenced by our high percentage of repeat business with around 90% of our revenue coming from clients with whom we have been working with for 15 years or more. To date we have carried out more than 1400 projects for over 130 clients in over 30 countries. Our clients include public and private organisations, as well as international organisations such as the International Atomic Energy Agency, European Commission, International Energy Agency and Nuclear Energy Agency.

Quintessa works to a Quality Management System and an Information Security Management System that have been independently certified to operate in accordance with the requirements of ISO 9001:2015 and ISO 27001:2013, respectively, under the umbrella of the TickITplus scheme. Quintessa is also certified to the Cyber Essentials Standard, complying with the security requirements of the Cyber Essentials Plus scheme. Quality, security, and other management processes are incorporated into the web-based Quintessa Information System (QIS) to allow information to be shared, processed and analysed across the Company. Quintessa's operations are carried out with due regard to their potential environmental impact, as described in our Environmental Policy Statement.

Quintessa is registered in England, number 03716623. Its registered address is The Hub, 14 Station Road, Henley-on-Thames, RG9 1AY, United Kingdom.