Company Overview

We are a technology company with over 35-year heritage serving Defence, Government, Business and Education in the UK and around the world.
Our long-term customers include high-level Government departments, which rely on us to provide services and systems that are critical to our national security and defence.

Part of Cohort plc since 2006, we deliver trusted and tailored services and solutions that improve the security, efficiency and effectiveness of operations. Whether our customers need us to manage the full life-cycle of a solution, designed especially for their operations, or one-off consultancy, our highly-skilled experts deliver a world-class service in our specialist areas.

Since the risks and threats to all organisations are continually evolving, we are always working to develop ways of keeping our customers' technology secure. Our ISO accreditation 27001 and other certifications mean we meet required industry standards. Furthermore, our teams strive to exceed these requirements in order to deliver outstanding work.


Working as your partner, we provide electronic warfare operational support, cyber security, information warfare, digital forensics and support to military operations business.

Accreditations and Qualifications

Our integrated Business Management System for Quality, Engineering and Information Security Management is certified by Lloyd’s Register (Lloyds Register Quality Assurance) as complying with the requirements of:

For activities including, and associated with, contract supply for Government, defence and security, intelligence, law enforcement, aerospace, educational and commercial sectors for:

  • Design, development, integration, delivery and support of bespoke and/or COTS based hardware, networks and software solutions or products;
  • Provision of managed services covering IT Service Delivery, Facilities Management, and software solutions;
  • Provision of research and development, training, consultancy and analysis services;
  • Provision of technical staff to customer requirements.

Corporate responsibility

We put our people at the centre of the business. Not only do we strive to support employees' career development, but we also encourage everyone to get involved in supporting our chosen charity partners, including the SSAFA, Royal British Legion, Lymphoma Action and Combat Stress.

Staff are always keen to raise much-needed funds through fun and ambitious events – from triathlons to marathons.

In addition, we support young people by providing work experience opportunities in our St Neots and Lincoln offices. Whether they want to work in software development or ICT support, we can help them gain valuable real-world experience.

We conform to the Anti-Bribery Policy of our parent company Cohort plc.

View our Gender Pay Gap report

Armed Forces Covenant

MASS is part of the Armed Forces Corporate Covenant. The covenant is an agreement between the armed forces community, the nation and the government. It encapsulates the moral obligation to those who serve, have served, their families and the bereaved.

The covenant’s twin underlying principles are that members of the armed forces community should face no disadvantage compared to other citizens in the provision of public and commercial services; and that special consideration is appropriate in some cases, especially for those who have given the most such as the injured or the bereaved.

 Read more about the Covenant:

Financial Information

MASS has continued to make an important contribution toward the Group’s revenue and profit growth.

Cohort plc Financial Reports

View Cohort plc results, reports and presentations

Dun & Bradstreet Rating 1
We are registered as a D&B Rating 1 Company (highest level of creditworthiness, minimum risk of failure)

View our D&B Rating 1 certificate

Company Values

Collaboration - Working together we build strong partnerships and relationships with our colleagues, customers and suppliers. We believe in proactively seeking out different perspectives, breaking down silos and communicating the ‘why’ behind the decisions we make and looking beyond the events of today to help our company succeed in the future.

Innovation - Actively encouraging creativity and drive to continuously enhance and adapt our own and customers’ operations, technology and processes to better serve our clients in all global market sectors.

Excellence - We are proud to deliver an excellent service and have high aspirations, expectations and focus on meeting deadlines whilst exceeding customer expectations. We encourage celebrating success. 

Respect - We respect one another, recognising that our future growth depends upon the commitment, capabilities and diversity of our colleagues. Being honest and forthright in everything we do; while understanding and valuing the contributions and priorities of others. ​​​

Cohort plc

Cohort is the parent company of six innovative, agile and responsive businesses providing a wide range of services and products for British, Portuguese and international customers in defence, security and related markets.

Cohort was founded on the principle that SME-size businesses can prosper by being part of a larger group, where they can benefit from financial oversight, management support and the exchange of information and practices. We aim to achieve this while preserving the high growth potential of innovative independent businesses.

We aim to add real value through the experience and contacts of our senior team while providing a light-touch but effective governance framework to our subsidiaries. Our objective is to deliver value to shareholders through our five operating subsidiaries: Chess, EID, ELAC SONAR, MASS, MCL and SEA.

The headquarters of the Cohort Group are in Reading, Berkshire and in total we employ around 950 core staff there and at our other operating company sites across the UK and in Portugal.

To find out more about Cohort plc visit

Leadership Team

Andrew Thomis

Cohort Chief Executive

Andrew graduated from Imperial College, London in 1987 with a Master of Engineering degree in Electronic Engineering and Management Science. He joined the Ministry of Defence as a fast stream technology specialist, spending the early part of his career on the directed energy weapons research programme at the Royal Signals and Radar Establishment, Malvern.

Subsequently, he held a project management role, acquiring special electronic warfare equipment for counter-terrorism use, and was a scientific adviser to the UK defence staff on land warfare matters. In 1996, Andrew joined Alvis plc in a role covering strategy, mergers and acquisitions, and business development. Following the BAE Systems' takeover of Alvis, he created Cohort plc with Nick Prest and Stanley Carter.

In May 2007, Andrew was appointed Managing Director of MASS and he re-joined the Cohort board, succeeding Stanley Carter as Chief Executive two years later. He remains on the MASS board.

Simon Walther

Cohort Finance Director

After graduating with a BSc from University College, London, Simon went on to qualify as a chartered accountant with Touche Ross in 1992. He moved to the Peninsular and Oriental Steam Navigation Company (P&O) in 1993 - he was appointed a chief accountant for P&O European Ferries in 1995.

Two years later, he was appointed Group Financial Controller at Alvis, going on to join Cohort as Finance Director in May 2006, bringing considerable industry experience acquired at Alvis and BAE Systems. Simon is also Company Secretary of Cohort plc.

Chris Stanley

MASS Managing Director

After graduating with a BSc in Astrophysics and master’s degree in Microwave Solid State Physics, Chris started his career designing radar systems and antennas for Racal Defence. He then spent six years developing radar and IR countermeasures for the RAF at the Electronic Warfare Operational Support Establishment.

He progressed to Manager at the Mathematical Modelling Group, where he was responsible for the design and development of advanced radar systems for GEC Avionics over four years. During this time, he also gained his MBA from Henley Management College. From there, Chris managed and directed the technical services business unit at the VT Group before joining MASS in 2007 to head up the EWOS division.

Rob Jones

MASS Business Development Director

Rob joined MASS in 2011 following a 22-year career in the British Army with the Royal Corps of Signals and the Intelligence Corps. During his military career Rob served in the UK and Germany, and on a number of operational deployments in the Balkans and Iraq.

Upon joining MASS, due to Rob’s comprehensive knowledge of the Electronic Warfare domain, he was employed as Senior Consultant, delivering EW training to overseas customers. Later, he became Head of EW Business Development, and in July 2018 was appointed as Business Development Director.

Karl Evans

Strategic Systems Director

A former Royal Navy Officer, Karl served as Submarine Warfare Officer on diesel and nuclear-powered submarine operations during the Cold War. This included two trips to the North Pole. Subsequently, he commanded the Trident submarine HMS Vanguard, for which he was made an OBE.

He is a graduate of the Joint Service Command and Staff Course and Kings’ College London Masters in Defence Studies. Following policy jobs ashore in Washington DC and the MOD at Whitehall, he joined the National Security Secretariat at the Cabinet Office where his portfolio included the nuclear deterrent. Franco-British and NATO Summit meetings were highlights of this period.

With his wealth of experience in this area, Karl joined MASS in 2014 and is now Head of Strategic Systems.

Catherine Werrett

Finance Director

Qualifying as an accountant over 20 years ago, Catherine has had a long established career bringing a sound financial presence to the companies that she has worked for.  Her career started with a local water company, where, post qualification, she quickly progressed to being amongst their youngest Senior Managers.

During her time there she grew her understanding of Business Partnering, becoming a “bridge” between typically segregated Operations and Finance departments.  Over her 13 years with the company she developed her knowledge and understanding of complex costing systems and was involved in many specialised IT system implementations, including SAP. Catherine’s final progression within the company lead to her involvement in a recent acquisition where she was exposed to a more commercial environment.  This exposure inevitably led her to seek a position of Finance Director within the SME market.

Following the birth of her two children she successfully guided a small car leasing company to grow extensively under her watchful eye over a 10 year period.

On the back of this success, Catherine joined MASS as Finance Director in April 2019.

Steve Townsend

Group Head for Training Support

Steve had a successful 31-year career in the Royal Air Force, initially as a Tornado pilot and, subsequently, instructing on Tucano, Bulldog, Jetstream, Tutor and King Air aircraft. His postings included Deputy Director Strategy, Combined Air Operations Centre, Al Udeid, Qatar; Station Commander RAF Cranwell and Officer Commanding No 3 Flying Training School; DACOS J7, Permanent Joint HQ; Senior Adviser to the Iraqi Air Force; and Chief of Staff, No 22 (Training) Group.

Having left the Service, he joined SCS to run the contracts at Northwood with Joint Forces Command and the EU Operational HQ. Steve was then promoted to Head of Training Support Group and became part of the successful transition of the Group from SCS to MASS in 2016.

Steve continues to be the Group Head of Training Support at MASS.

Jack Stark

Chief Information Officer

Having previously worked in education, local government and technical training, Jack joined MASS in 2006 in an IT role for the then new Lincoln office. He has since performed a number of roles in the business, gaining exposure to all aspects of work the company does and its supporting functions.
Jack took up the role of CIO in 2016, having previously joined the management team in 2012.

Michelle Lynch

Head of Human Resources

Michelle started her career at a large technology company where she stayed for 10 years and gained her MCIPD. On relocating to Cambridgeshire, she moved into HR managerial roles, which included the pharmaceutical, and benefits and rewards industries. During this time, she returned to college to gain her CMI.
In July 2014 Michelle joined MASS as HR Manager, and in 2016, moved into the role of Head of HR.

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