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  • Mariyam Anwar

    HR Manager Mariyam is an experienced HR Manager with Associate CIPD Level 5 certification and a strong background working across small start-up and scale-up organisations. Having supported businesses through periods of rapid growth and change, she brings a calm, adaptable approach to developing and implementing effective HR strategies that improve efficiency and streamline people processes….

  • Katie Kelly

    Property Accounts Administrator Katie is an experienced accounts professional with a strong background in managing financial operations, reporting, and compliance, dealing with day to day tasks within the department, inputting accurate data onto inhouse systems. They specialize in accounts payable and receivable, reconciliations, with attention to detail. Katie has improved efficiency and supports her team…

  • Katina Skiadopoulos

    CRE Administrator Katina, based in Graham + Sibbald’s London office, originally hails from Australia, where she worked as a secondary school language teacher. She joined Graham + Sibbald following the acquisition of Aitchison Raffety in 2025. Katina joined the company in 2002, initially at a small firm that was acquired by Aitchison Rafferty in 2007….

  • Karen St Helen

    Associate Director Karen has over 25 years in the property business including Landlord and Tenant work but predominantly valuations for secured lending. Karen has undertaken a variety of secured lending work covering, London, Essex, parts of Berkshire, Hertfordshire, Kent and Suffolk. She has obtained a good level of knowledge across property sectors such as residential,…

  • Ian Wimpenny

    Managing Director Ian joined Graham + Sibbald following the acquisition of Aitchison Raffety in 2025. Ian joined Aitchison Raffety in 2021 and was appointed Managing Director in 2024. With over 20 years’ of experience in the real estate valuation industry, Ian was responsible for the business’ valuation service line. Ian is a Chartered Surveyor and…

  • James Rutter

    Surveyor After graduating with a 2:1 in Real Estate Management at Oxford Brookes University, James gained over ten years of experience in commercial property. He now works in the healthcare team as a chartered surveyor having joined Aitchison Raffety in April 2025. James completes a variety of work including valuations, lease renewals and rent reviews as…

  • Charlotte Ray

    Associate Director Charlotte joined Graham + Sibbald in February 2026, with 5 years PQE experience and over 10 years experience in property. Charlotte graduated from the University of York in 2014 and undertook a post-graduate qualification at Harper Adams University in 2015/16. Charlotte specialises in valuing commercial and residential Real Estate, including but not limited…

  • Gerard Barry

    Senior Director Gerard Barry leads the Transactional and Capital Markets function at Graham + Sibbald, heading the firm’s commercial agency department and overseeing all management and strategic activity within the team. He works closely with the Executive Board on company-wide strategy while driving growth initiatives to expand the firm’s commercial agency offering nationally. With over…