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John Clissold's work experience includes:

- Vice President of Infrastructure and Security at LISCR since January 2023.

- Director of Information Technology Infrastructure at LISCR from November 2020 to January 2023.

- Director, Systems Engineering at MicroStrategy from October 2017 to July 2020. Managed a global team providing 24x7 support, introduced new technology, and led the virtualization to Office 365 services project for 2700 users.

- Senior Manager, IT Operations at MicroStrategy from May 2012 to October 2017. Defined and implemented IT Operations strategy, managed project portfolios, and aligned objectives to enterprise strategies.

- Technical Consultant at Dell from September 2010 to July 2012.

- IT Manager at APS Project Management from 2008 to 2010.

- Solutions Architect at LSI Technology Solutions Limited from April 2005 to January 2007.

- Senior Technical Consultant at Solsoft from April 2004 to April 2005. Designed and implemented infrastructure solutions, including DNS, AD, backup strategies, and migration strategies.

- Senior Systems Engineer at MicroStrategy from August 2001 to April 2004. Designed and documented Active Directory migrations, implemented backup solutions, and documented migration procedures for Exchange.

- Global Infrastructure Specialist/International Account Manager at GlaxoSmithKline from June 2000 to August 2001. Produced training material, documented interoperability procedures, and installation guidelines for Norton Antivirus.

John Clissold attended Cardiff University / Prifysgol Caerdydd from 1986 to 1988, where they obtained an ONC degree in Business Studies. In addition to their formal education, John Clissold has obtained several certifications, including the Cybersecurity Leadership Certification from Proofpoint in March 2022 and the Microsoft Certified: Azure Fundamentals certification from Microsoft in August 2020. John is also a charter member of the Microsoft Certified IT Professional: Enterprise Messaging Administrator on Exchange 2010 (MCITP) and the Microsoft Certified IT Professional: Lync Server Administrator 2010 (MCITP). The specific dates of obtaining these certifications are unknown.