Our Company

Founded in 2008 and with its HQ in the UK, near Reading, Osirium’s management team has been helping thousands of organisations over the past 25 years protect and transform their IT security services.

The Osirium team have intelligently combined the latest generation of Cyber-Security and Automation technology to create the world’s first, built-for-purpose, Privileged Protection and Task Automation solution for the Hybrid-Cloud world.

Tried and tested by some of the world’s biggest brands and public sector bodies, Osirium helps organisations drive down Business Risks, Operational Costs and meet IT Compliance.

Osirium is backed by venture investors who have an established track record in identifying emerging market leaders.


  • Osirium protect Infrastructure

    In a Hybrid-Cloud world protect your IT infrastructure

    In today’s hybrid-cloud era, protecting IT assets is more complex than ever, with legacy IT systems, virtualized environments and 3rd party out-sourced service providers engaged across public and private clouds. With such a dispersed infrastructure, the privileged insider and outsider have become inter-changeable and the traditional idea of the security perimeter has dissolved.

  • Osirium Privileged Task Automation

    Outsource your IT Services not your Trust and Security

    Whether your IT infrastructure is in the cloud, on premise or a hybridised mix of both, Osirium protects your critical assets and transforms privileged management activities by automating tasks. Complex, time-consuming or volume based activities can now be automated and executed securely and error-free, particularly useful when out-sourcing services to 3rd parties or the Help-Desk.

  • Visibility and Accountability

    At the Heart of your Hybrid-Cloud infrastructure Visibility and Accountability

    Positioned at the heart of an organisation’s infrastructure, Osirium secures all system administration activities and provides a real-time overview, ensuring every change is accountable, visible and auditable. Such transparency in action reduces operational risk through Osirium’s least privileged access model and its flexibility in meeting the many different compliance needs in today’s hybrid-cloud infrastructures.


  • David Guyatt

    David Guyatt

    Co-founder of Osirium, the management team is led by David Guyatt, who has over 25 years’ experience in turning next generation IT products into successful technology businesses.

    He is a recognized pioneer in establishing the content security software market, being a co-founder and CEO of MIMEsweeper, which became the recognized world leader in content security solutions, with a 40% global market share.

    Previously, he was Sales & Marketing Director at Integralis from 1990-1996, as it established itself as the Europe’s leading IT Security integrator.

  • Simon Lee

    Simon Lee

    Simon Lee is an International Advisor to Fairfax Financial, Global Advisor to SATMAP Inc, Non Executive Director of TIA Technology and Chairman of Hospice in the Weald.

    Until December 2013, Simon was Group Chief Executive of RSA Insurance Group plc, a FTSE 100 company, operating at the time in 32 countries, employing around 23,000 people, writing c£9bn in premiums with assets of c£21bn.

    Previously, Simon spent 17 years with NatWest Group, working in a variety of roles including; Chief Executive NatWest Offshore, Head of US Retail Banking, CEO NatWest Mortgage Corporation (US) and Director of Global Wholesale Markets.

  • Rupert Hutton

    Rupert Hutton

    Rupert served for 12 years as Finance Director of AIM quoted Atlantic Global Plc, a cloud-based project management service, before being sold to a US-based software company.

    Previously, Rupert was Group Financial Controller of the North Bucks Chamber of Commerce. His early career and formal training took place with Grant Thornton and has an AMBA accredited Masters in Business Administration and is a Fellow of the Association of Chartered Certified Accountants.

  • Kev Pearce

    Kev Pearce

    Kev Pearce, co-founder, has over 15 years’ experience in the planning and deployment of corporate IT infrastructure projects, as Head of Consulting at Integralis. His customer experience reaches across multiple industry sectors with clients including Experian, Allianz, BP, European Bank for Reconstruction & Development, Homebase, Barclays, HMRC.



  • Catherine Jamieson

    Catherine Jamieson
    Operations Director

    Catherine was VP European Operations at MIMEsweeper which, under her leadership from 1997-2000, grew the European business from $3million to over $15 million in three years, consistently achieving revenue growth of over 100% p.a. with over 50 channel partners in 12 countries. Previously, Catherine was the Sales Manager at Integralis between 1991-1997.

  • Andy Harris

    Andy Harris
    Engineering Director

    Andy has over 25 years’ experience inventing and building unique IT networking and security products and has worked with David Guyatt for over 24 years, latterly as co-founder and CTO of MIMEsweeper, but also as Technical Director at Integralis. From his vast portfolio, the products with most industry impact have been MIMEsweeper, the IP Translation Gateway and Disaster Master.



  • Stephen Roberts

    Stephen Roberts
    Marketing Director

    Stephen joins Osirium with over 20 years’ technology marketing experience, leading the marketing efforts of brands including Fujitsu where he helped grow market share and build a £100m Intel server business. He was also UK Marketing Director at Integralis during its acquisition by NTT Group. As Director of Marketing at Stericycle ExpertSolutions, Stephen helped create the digital footprint and built a number of unique thought leadership pieces featured in live news media, building demand for the companies’ services. Before joining Osirium, Stephen was Senior Evangelist and Content Manger for English speaking regions at Wallix Group.



  • Tim Ager

    Tim Ager
    Sales Director

    Tim has held senior management roles at a number of IT security companies for over 15 years. Most recently he was Managing Director for the EMEA region at Celestix Networks where he was responsible for driving significant growth of the company’s security portfolio. Previously Tim was responsible for sales at pan-European security distributor Allasso. Prior to that, Tim was responsible for overseas business at Bottomline Technologies, providing secure payment solutions to the finance and corporate sectors.



CareersWith Osirium