Sian Lumsden

 Siân Lumsden

 Siân Lumsden

PG Certificate in Business
Personal & Executive Coaching

‘Thank you so much for a thoughtful and thought provoking LDP feedback session. Your knowledge and your insightful questions were really helpful’
Sandy Oosthuysen, N&W HCP Leadership and OD Lead

Siân creating developmental inquiry based Coaching relationships, with leaders, teams and coaches, working across organisational systems

Siân works in a highly relational manner, and possesses great skill in establishing a trusting, creative and generative environment in which individual clients and, in particular, teams can do their best developmental work. She adopts a coaching style that encourages both vertical and horizontal development whilst offering clients a broad menu of approaches and methodologies arising from a career spanning over 25 years of leadership and team development work. Her work generates deep inquiry into compelling purpose in times of change and complexity, whilst creating space for teams to dismantle the obstacles that are obstructing their response to that purpose.


A highly relational coach working with Leaders, Executives and Teams and an experienced Leadership Consultant, Siân specialises in working with Boards, Top Teams, CEOs and C-suite Executives to help them clarify their purpose, leverage their key relationships and build meaningful connectivity across their systems. Her passion is to help leaders and teams build transformational relationships with each other and across their whole organisations.

Siân holds a Post Graduate Certificate in Business, Personal and Executive Coaching from University of Chester, is a qualified Team Coach (Team Coaching Studio) and alumnus of the 2019 Nautilus International Team Coaching programme and her work in team coaching has been widely received within a variety of organisations across NHS England.


After working for some years as a leadership trainer within the aerospace sector Siân established her own firm in the mid 1990s, working extensively with leaders and their teams within the banking, financial, and communications sectors. Over subsequent years she gained wide experience in the health and professional services sectors, eventually joining forces with Ian Mitchell to create a leadership & team coaching and coach training & development practice built around developmental inquiry and the exploration of meaning. A significant number of Siân’s clients have worked with her for many years and it remains one of her great joys to meet up with executives in various organisations and reminisce with them about coaching conversations they shared, perhaps over a decade ago, back in the early days of their leadership career.   



Community of Practice

Harthill has created and sustains a collaborative group of coaches, consultants and facilitators in a Community of Practice,

which supports our own transformation and the transformation in individuals, teams, organisations and society. Each person who completes the LDF Authorisation is included in the Community and enriches our work.


Developmental Events

Orchestrated and choreographed by Rebecca Stevens, the Community is beginning to buzz with ideas, connectivity, sharing of experiences, co-inquiring into aspects of our work and the field. Harthill has created and curated a range of developmental Events which serve this purpose and some are also available to those outside the Community of LDF Authorised Practitioners.


Collective Inquiry Groups

Harthill has also launched a series of Collective Inquiry Groups - Community Inquiry, Developmental Inquiry, Practice Inquiry. We have also launched FrameChangers - like a book group for sharing and discussing any books, articles, videos or indeed any material that has shifted our frames of reference, triggered a new line of thinking or developmental idea.


Wisdom Council

Under the guidance of Dr Stephen Duns, we have also initiated a Thought Leadership space, with a Wisdom Council providing guidance and oversight, a planned annual Conference at which we will share new thinking, and a supportive group that will facilitate the research and studies that can lead to the publication of articles in our field.


Our Collaborators

Harthill seeks to attract those in the field with whom there is a "resonance", and we are proud to have many Collaborators who are aligning with us, sharing their experiences and contributing directly to our work


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