One Rock Team Members

Mark Williamson

Mark Williamson

Founder & Director

Mark leads the curriculum development on Discerning Vision and Leadership Skills, and has written biographies on John Wesley and William Wilberforce. Outside of One Rock he is chair of the Fresh Expressions church planting movement, and leads the Sanctuary community in central London. He supports Liverpool FC, loves talking about good films, and going for long walks with Joanna.

Dr Joanna E. Williamson

Dr Joanna E. Williamson

Founder & Director

Joanna leads on the curriculum development in Spiritual Formation and Global Mission, is the founder of SheLives, and the author of biographies on Hudson Taylor and Amy Carmichael. Outside of One Rock she lectures at Westminster Theological Centre, and directs the MA in Public Leadership at Waverley Abbey College. She loves nature, travel and learning languages.

Geoff Elliott

Geoff Elliott

Associate Trainer

Geoff took early retirement from Mars Corporation several years ago, and now leads One Rock training workshops on leadership and coaching. A former Mars Associate, he held several senior leadership positions in the organisation, including overseeing their business in Greece and in Poland. His final position was Human Resources Director for their Asia Pacific region.

Joy Da Costa Moyo

Joy Da Costa Moyo

Prayer Coordinator

Joy coordinates the prayer for the work of One Rock. She sends out the Pebbles prayer updates to our supporters, and takes a lead role in evening prayer meetings we hold for the work. Alongside prayer, she is passionate about helping people to discern more clearly God’s vision for their lives. She launched the Kahaila¬†missional cafe in the City of London in 2016.

Marcel Bonfim

Marcel Bonfim

IT Consultant

Marcel advises on all the IT issues related to One Rock, and acts as lead consultant in the development of our online Learning Institute. Based in Curitiba, Brazil, Marcel is founder and director of Support Press, a web development and IT solutions company that serves churches and ministries in their communications, and also of the One Page website solution.

UK Board Members

One Rock is a UK registered charity (number 1138433) governed by a Board of Trustees; current members are Peter Calderbank, Naomi Paul, Luke Hamlyn and Abby Herring.

Peter Calderbank

Peter chairs the One Rock board. He is the chief executive of Field Lane (, a charity providing housing, care and support services to meet the needs of vulnerable families and individuals. He has a wealth of experience in the UK charity sector, both as a trustee and as a chief executive.

Naomi Paul

Naomi is the Fundraising Coordinator at the Global Network of Civil Society Organisations for Disaster Risk Reduction (, the largest international network of organisations working in the field of disaster relief. She brings experience in fundraising, the UK charity sector, and the implementation of international programs.

Luke Hamlyn

Luke is an itinerant worship leader, facilitator and musician ( He works with a wide range of churches and organisations, and is passionate about seeing people and organisations realize their potential, purpose, and place.

Abby Herring

Abby is an entrepreneur, a youth worker and a baker. She works as a freelance (and excellent!) cake baker, a volunteer youth leader with her local church, and a part time cafe worker. Her dream is to open a missional cafe. She is an alumni from the very first Academy of Spiritual Leadership run by One Rock.

US Board Members

In the United States One Rock is a registered 501(c)3. Board members are Scott Stover, Rev Kerry Purselle, Wallis Shoppy, plus Joanna Williamson and Mark Williamson.

Scott Stover

Scott chairs the US board. He is a Team Director at Chick-fil-A corporate, with years of experience in coaching on leadership and team dynamics.

Kerry Purselle

Kerry is the Treasurer of the US Board. She is a retired United Methodist Minister, and served as a pastor in Poland as well as the USA.

Wallis Shoppy

Wallis is director of corporate procurement at Chick-fil-A, and prior to this has held senior positions at Delta and Wal-Mart.

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