A blend of behavioural change expertise, for the blended change you need.

Marina Lumley

Change Leader

As our Change Leader and founder partner of GreenGrass Consulting, Marina will usually be your first point of contact. She’s a champion for the human side of change. A professional coach with an MSc in Coaching and Behavioural Change, Marina is collaborative by nature with boundless energy – working with CEOs, MDs, L&D, HR, teams and individuals across a range of industries and organisations including BT, EE, G&W, Direct Line, Cavendish Nuclear, Suzuki and Saatchi & Saatchi.

After a first career as an advertising board director working in strategy and communications, Marina brings to life a powerful methodology combining rigorous diagnostics and coaching to bring about long-lasting change. 

  • MSc Coaching and Behavioural Change (Distinction)
  • Professional Certificate in Coaching (PCIC)
  • Certificate in Systemic Team Coaching (AOEC)
  • Denison Consulting Partner, accredited to deliver the Denison Organisational Culture Survey (DOCS)
  • APMG Change Management Practitioner
  • Vital Signs Assessments for individuals, teams and organisations (SixSeconds)
  • Certified in PPA (DISC) profiling
  • Hogan accredited
  • Emotional intelligence Assessor and Practitioner; Brain talents; Brain profiles; (SixSeconds)
  • Dare to Lead Trained

Libby Child

Performance & Resilience Coach

A founding partner of GreenGrass following a career in international advertising, Libby has, for the past fifteen years, focussed on improving team performance within the context of organisational culture. Libby also runs our Resilience workshops, which improve individual and team adaptability and capacity to change.

Stuart Somerville

Critical Environment Consultant & Coach

Stuart brings strategic clarity to our clients’ complex problems. His reputation precedes him as an experienced guide in delivering in-depth culture change with medium and large organisations, in both the private and public sector. Stuart is a Professor of high-performance behaviour in complex and critical environments.

Emma Jefferys

Strategic Thinking and Coach

Emma combines a strategic planning brain with the power of coaching and emotional intelligence to deliver change everyday interactions with our clients.

Teresa Leyman

Agile Coach & Project Manager

Teresa supports clients through a powerful and unique combination of both systems and engineering and behavioural change and psychology. Having led many business change projects from both systems and agile project management philosophy and also attending to the human side of change through coaching.

Scott Owens 

Senior Quantitative Researcher

Scott is a quantitative senior researcher developing and delivering research, insight and analytics to support our clients.

Melissa Hague 

Leadership Coach & Dare to Lead Facilitator 

Melissa is a leadership coach and Dare to Lead Facilitator who brings many years of L&D programme development and coaching to GreenGrass, together with experience in driving successful cultures.

Merryn Walters 

Strategic Thinking Partner 

Merryn is a writer and what we call a strategic thinking partner – she’ll help you, your teams, and your senior leadership to articulate their vision and values; creating the written words to support and drive your ambition forward.

Larisa Sohorca 

Emotional Intelligence Programme Designer & Coach

Larisa is an Emotional Intelligence (also known as EQ) practitioner who excels in designing and delivering programmes that shift culture and connect people.

We’re all used to working online now. Drop us a line, arrange a Lunch&Learn or a quick catch-up on the art of the possible.


Would you benefit from coaching that helps you demonstrate YOUR vision and values in your work environment? Do you have teams that work well, but aren’t working as well as they might be – together? GreenGrass can help.