Lindsey Masson

Associate Partner

Lindsey is an international OD Consultant & Coach She particularly works in the areas of change, leadership, team and one-to-one coaching. Lindsey has a wide range of consulting and facilitation experience partnering  with organisations and teams that need to become more effective in creating and delivering on strategy and enabling greater ownership of change.

She designs and delivers high impact interventions- from executive team facilitation to facilitating 400 people in the room, using participative approaches to bringing about change. She is an Ashridge-accredited coach and trusted thinking partner to CEOs, Partners, and Directors. Her work supports leaders to operate strategically across diverse contexts — often focusing on deepening self-awareness, enhancing executive presence, and navigating stakeholder relationships with greater impact.

Over the last 25 years she has combined her coaching and consulting career with a number of leadership roles, with P&L responsibilities  at Ashridge Business School.  Previously. she worked in leading  consultancies in Europe, Southern Africa and the  USA, having started her career as a Mechanical Engineer.

Lindsey works both within the UK and internationally in a number of sectors including financial services, technology, retail, professional services, manufacturing, pharmaceuticals, energy, further education, health and the public sector.  Recent clients include Carlyle, L1 Energy, PwC, Worldline, Grundfos, Hines, Haleon, Novartis, Bayer, and Ericsson. She is a mechanical engineer by training, and accredited Ashridge Executive Coach. She also holds an MSc in Responsibility in Business Practice.

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The Team


Sophy Pern


Partner

Sophy is an international consultant, facilitator and executive coach. Working with executive leaders and teams on strategy engagement, organisation design and operating models, culture change and team development. She develops Organisation Development and Design capability in-house in client organisations, and with professional bodies across Europe.

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Andrew Day


Partner

Andrew is a consultant, facilitator and coach with over 30 years of international experience, both as an internal and external consultant. He helps leaders design and develop their organizations strategically, specializing in leadership team facilitation, executive coaching, and participative organisational development.

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Mark Emdin


Partner

Mark brings a rare mix of rigour, warmth, and practical insight to the complex work of aligning leadership, structure, and culture. A consultant, facilitator, and team coach, he specialises in untangling organisational complexity, redesigning operating models, and enabling senior teams to perform at their best.

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Tim Haynes


Associate Partner

Tim is a skilled consultant, group facilitator, coach, and accomplished data-driven Organisational Design & Development leader with close to three decades of experience in FTSE Top 10 as well as high-growth global companies. Tim has operated as an internal organisational consultant and leader on numerous major change efforts over the years.

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Hélène Casanova


Associate Partner

Hélène Casanova is a seasoned expert in organisational transformation, cultural change, and leadership development, with a distinctive background in finance that brings a data-driven, business-oriented approach to HR and OD strategy. She has led large-scale change management, M&A integrations, and talent development initiatives across multiple industries.

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Sander van Muijen


Associate Partner

Sander van Muijen is a seasoned consultant in leadership & change, executive coach, senior leadership team coach, as well as researcher and lecturer. He specialises in top team effectiveness, adaptive leadership, and large-scale culture and change programs. His work blends organisational insight with deep personal inquiry.

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Olivia Margo


Associate Partner

Olivia specialises in organisational dynamics and leadership. She offers executive coaching, supervision, and exec team coaching. Clients present with a wide range of challenges related to the complexity of large-scale operations, an uncertain context, shifting paradigms of leadership, and personal dilemmas.

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Simon Martin


Associate Partner

Simon is a strategic organisation development and design consultant who works internationally supporting clients in transforming their organisations and developing learning cultures. Common areas of focus for his work include strategy engagement, organization design, leadership, executive team development and culture change.

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For more information contact:
hello@ammalo.org

Want to speak to one of the team?  Drop us a line on hello@ammalo.org and we’ll be in touch.