One Rock Team Members
Mark Williamson is one of the founders and co-directors of One Rock. He leads the curriculum development on Discerning Vision and Leadership Skills, and coordinates the work across Africa. He has written biographies on John Wesley and William Wilberforce. Outside of One Rock he is an Associate Minister with Fresh Expressions, and leads the Prayer for London movement. He supports Liverpool FC, loves talking about good films, and going for long walks with his wife Joanna.
Co DirectorJoanna is a co-founder and co-director of One Rock. She leads on the curriculum development in the areas of Spiritual Formation and Global Mission, and also on partnerships in the United States, Latin America and Asia. She is the author of biographies on Hudson Taylor and Amy Carmichael. Outside of One Rock she is a trustee of Renovare Britain and Ireland, and a lecturer at Westminster Theological Centre. She is currently completing her Doctorate at Asbury Theological Seminary. She loves nature, travel and learning languages. If she could she would love to have a German Shepherd and take him for long walks.
Associate TrainerGeoff 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. When not training leaders Geoff enjoys playing golf, reading history and supporting Wolverhampton Wanderers FC.
IT ConsultantMarcel advises on all the IT issues related to One Rock, and acts as lead consultant in the development of our online Learning Academy. Based in Curitiba, Brazil, he also supports much of the training that takes place across that nation. Marcel is founder and director of History Makers, a web development and IT solutions company that serves churches and ministries in their communications.
Joy Da Costa
Prayer CoordinatorJoy 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 works for the Kahaila missional cafe in east London, and is excited about living out her own vision when she launches a similar cafe in the City of London in 2016.
US Team LeaderKerry is the US Team Leader, coordinating our work in the United States. A retired United Methodist pastor, she loves spending time with her grandchildren, but also finds time to volunteer for several other causes. She served time as a missionary in Warsaw, Poland, and now resides in North Carolina.
One Rock is governed by a Board of Trustees; current members are Peter Calderbank, Antoinette Daniel, and Luke Hamlyn.
Peter chairs the One Rock board. He is the chief executive of Field Lane (www.fieldlane.org.uk), 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, having served on numerous boards (including the Association of Chief Executives of Voluntary Organisations), and previous as chief executive of BSS.
Antoinette is founding director of Just Helpers (www.justhelpers.co.uk), an ethically-focussed, London-based cleaning company. She has formerly worked as a netball coach, and as director of an anti-trafficking organisation raising awareness about modern day slavery happening in London.
Luke is a freelance worship leader, facilitator and musician (www.lukehamlyn.co.uk). He regularly leads worship at his home church (Bless Community Church in West London) and for the A Call To Business network. He has played regularly alongside such worship leaders as Andy Flannagan and Noel Robinson.
In the United States One Rock is a registered 501(c)3. Board members are James Fillingame, Juliet Hall, Rev Kerry Purselle, Jim Whitcomb, Joanna Williamson and Mark Williamson.