Summary
Work History
Education
Skills
Signature Career Highlights
Core Competencies
Certification
Thought Leadership
Work Availability
Work Preference
Timeline
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Nelly Twumasi Mensah

Nelly Twumasi Mensah

Change Management
London

Summary

Accomplished Business Change Expert with proven track record in leading strategic transformation initiatives. Skilled in strategic planning, enabling organizational change maturity and technology, people and process optimization for superior outcomes for businesses, employees, and clients.

Experienced in driving large scale, complex organizational, and digitization programs focused on Delivery, Governance and Operational Excellence. Known for collaborating with leaders and influencing stakeholders to drive performance, foster growth and achieve strategic goals.

Prosci Certified Practitioner, MRICS, MSc (Project Management), BSc (Construction Engineering). Advisory Board Member, UCL Bartlett Faculty of Built Environment. Visiting Fellow, Nottingham Trent University School of Architecture, Design & Built Environment. Thought leader, speaker and featured in a variety of publications.

Work History

Business Change Director

AtkinsRéalis
London, England
09.2008 - 04.2025

Spearheading strategic, complex change projects and programs; managed cross-functional teams and developed change maturity and capability across the organization. Key projects and programs include:

  • ERP Implementation Program: Led change management for the global ERP implementation in UK & Ireland. Developed and executed comprehensive change management strategy, and driving 89% adoption at launch.
  • Global AI project: Project and change lead for first win work global pilot of generative AI tool. Engagement with vendor and senior stakeholders to maximize adoption.
  • People and Culture program - Program change lead, enabled successful restructure of UK & Ireland business for better market alignment and improved senior leadership collaboration.
  • Change Management Enablement - Applied change management methodologies and best practices to support global change projects, enhancing change capability within the business and achieving successful change outcomes.
  • Provided coaching and guidance to senior leaders on effective change leadership practices, strengthening their ability to drive transformational efforts.

Business Change Lead

AtkinsRéalis
London, England
01.2020 - 01.2022

Devised and executed business change strategies, offering expert advice with a strong emphasis on enhancing technical excellence. Key projects and programs include:

  • Technical Excellence Strategy and Program: Developed strategies and facilitated formation of new technical leadership groups to enhance collaboration within technical communities in UK&I business.
  • Global website redevelopment: Led a cross-functional team to revamp the global website, enhancing brand image, standardizing service language, and boosting web traffic by 55%.
  • Technical delivery hub redesign: Developed and implemented a change plan for the technical delivery hub redevelopment. This effort resulted in a 72% increase in platform usage and project delivery quality.

Business Project Manager

AtkinsRéalis
London, England
01.2016 - 01.2020

Led and managed end-to-end-delivery of business projects and change with a focus on digital transformation for UK&I and global operations . Key projects and programs include:

  • Client delivery platforms modernization: Directed globally distributed, cross-functional team in designing, building, and successfully launching technical delivery portal and cloud document management system using agile methodology. The project enabled the business to modernize key client delivery platforms, enhance efficiency by 30%, and improve competitive advantage.
  • Global digital products portal: Led global cross-functional team to design and launch a global digital products portal in agile environment, providing unified access to all digital tools and streamlining governance processes.
  • EDI Strategy and Operating Model Design: Formulated the Equity, Diversity, and Inclusion (EDI) strategy and designed the operating model for the UK & Ireland business. Led the appointment process for the EDI lead and identified primary focus areas to improve the workplace environment for all employees.

Construction Project & Program Manager

AtkinsRealis
London, England
01.2008 - 01.2016

Managed multi-disciplinary teams to deliver projects and programs in live client environments with complex stakeholder requirements and hierarchies. Key projects and programs include:

  • Senior Program and Change Manager: Led the client’s project and moves management teams to successfully deliver a £20 million corporate estate rationalization program. Corporate estate usage was optimized and income generation from the estate was increased by 48%.
  • Senior Project Manager: Led a multi-disciplinary team to deliver pre-construction phase of innovative STEM-focused 1200-place £32m new build EFA secondary school, addressing local school place shortages.
  • Project Manager: Managed a £5 million project to refurbish and fit-out presentation rooms. Created new meeting rooms in an operational bank, aligning with and enabling the client’s estate strategy.
  • Client Representative: Oversaw a £4 million project to replace operational prison houseblock roofs and demolish farm buildings, supporting client's maintenance obligations and future development strategy.
  • Assistant Project Manager & Contract Administrator: Successfully delivered a £7 million extension of a mail centre and refurbishment of a security centre, resulting in a 70% increase in mail centre capacity.

Education

Certified Change Practitioner -

Prosci
05.2025

Chartered Project Manager - Project Management

Royal Institution of Chartered Surveyors
01-2012

Master of Science - Project Management

University of Greenwich
London, ENG
2010

Bachelor of Science - Construction Engineering Management

Loughborough University
Loughborough, LEC
2008

Skills

Organizational Change Management

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Signature Career Highlights

  • Change Transition & Portfolio Management, Developed and implemented change portfolio management approach across the UK and Ireland. Provided better visibility of the change landscape, improved alignment with strategic objectives, and facilitated the identification of potential change saturation and collision.
  • Capital Infrastructure, Real Estate Rationalization, Led and delivered a £20 real estate rationalization program to Optimized corporate estate usage and increased income generation from the estate by 48%.
  • IT Application Modernization & AI implementation, Directed a global teams in designing, building, and launching technical delivery platforms and document management system using agile methodology. Led the design, plan and delivery of global AI pilots and scaling approach. Enabling digital transformation across the organization.
  • Change Transition for Integrated Offshore delivery Program, Developed and executed change management, cultural training, and communication strategies for a new offshore office serving UK&I. Achieved 97% team utilization within the first two months post launch.
  • User Adoption & Technology system rollout, Implemented a new expenses system in the UK&I region, reaching 80% adoption in three months.
  • Unified Global knowledge management, Collaborated with global stakeholders to establish a unified service lexicon and knowledge platform, aiding the development of global digital tools and modernizing digital platforms.
  • Technical delivery hub redesign, Developed and implemented a change plan for the technical delivery hub redevelopment. Resulted in a 72% increase in platform usage and improvements in project delivery quality.
  • Stakeholder engagement workshops, Designed & facilitated over 40 workshops for global programs. Provided context for senior stakeholders, clarified the change imperative and secured buy-in from key decision-makers.
  • EDI Strategy and Operating Model Design, Formulated the Equity, Diversity, and Inclusion (EDI) strategy and designed the operating model for the UK & Ireland business. Supervised the appointment process for the EDI lead and identified primary focus areas to improve the workplace environment for all employees.

Core Competencies

Change Management Expert, Consulting & Advisory, C-suite Engagement & Management, PMO, Governance, Strategic Planning Risk Management, Operational Readiness Assessment, Program Delivery, Operational Excellence, Business Process Optimization, People Practices, Team Management, Collaboration, Infrastructure & Capital, Construction, Group Enablement for Change Transition, Technology & Digital Programs, Generative AI, ERP Implementation, People & Culture improvement, Offshore Integrated Delivery Centre, Shared Services, Equity Diversity Inclusion Strategy

Certification

Certified Prosci Practitioner

Thought Leadership

  • Acumine - The AI Conundrum 2025
  • NCE Magazine 50th Edition 2022
  • RICS Modus Magazine 2021
  • Building Magazine 2019, 2020
  • Building Magazine Digital Series - Digital Transformation and the Pandemic, 2021

Work Availability

monday
tuesday
wednesday
thursday
friday
saturday
sunday
morning
afternoon
evening
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Work Preference

Work Type

Full TimeContract Work

Work Location

On-SiteRemoteHybrid

Timeline

Certified Prosci Practitioner

05-2025

Business Change Lead

AtkinsRéalis
01.2020 - 01.2022

Business Project Manager

AtkinsRéalis
01.2016 - 01.2020

Business Change Director

AtkinsRéalis
09.2008 - 04.2025

Construction Project & Program Manager

AtkinsRealis
01.2008 - 01.2016

Certified Change Practitioner -

Prosci

Chartered Project Manager - Project Management

Royal Institution of Chartered Surveyors

Master of Science - Project Management

University of Greenwich

Bachelor of Science - Construction Engineering Management

Loughborough University
Nelly Twumasi MensahChange Management