Mary Guest

Mary Guest is an accomplished HR professional with extensive experience in managing HR projects and change programs across multiple organizations. Currently serving as HR Projects Lead at Mitie since December 2020, Mary previously held positions such as Risk and Planning Manager at Interserve and HR Risk and Planning Manager at Rentokil Initial. Notable achievements include the integration of HR Shared Services teams, the implementation of a centralized HR Advisory Service, and improvements to payroll processes. Mary’s career also includes key roles at Serco and Tarmac Limited, where strategic contributions led to enhanced service delivery and operational efficiencies. With a professional background supported by an MCIPD qualification, Mary is recognized for delivering high-quality HR solutions aligned with business priorities.