Meet the team

The RZIM itinerant speaking team is complemented by our lecturers and tutors at the Oxford Centre for Christian Apologetics (OCCA), all of whom act as additional speaking resources for the trust, wherever possible. This combined team comprise some of the leading Christian thinkers of our time, with more than 150 years’ speaking and preaching experience between them. With additional support from the global team of itinerant speakers, the trust has a wealth of evangelist-apologists to call upon. Because the demand for our unique ministry continues to grow, we have also begun to develop a team of associate speakers throughout Europe.

The following list represents our main speaking team:

  • Michael Ramsden

    Michael Ramsden

    European Director

    Michael Ramsden has been European Director of RZIM since its foundation in 1997. He is also Director of the Oxford Centre for Christian Apologetics and Lecturer in Christian Apologetics at Wycliffe Hall, Oxford. While at Sheffield University doing research in Law and Economics, Michael taught Moral Philosophy and lectured for the International Seminar on Jurisprudence and Human Rights in Strasbourg. He has been invited to lecture to a variety of groups including the White House staff in Washington, D.C., leaders at NATO HQ in Brussels and Members of the European Parliament.

  • Amy Orr-Ewing

    Amy Orr-Ewing

    UK Director

    Amy Orr-Ewing is the Training Director of the RZIM and Director of Programmes for the Oxford Centre for Christian Apologetics. She speaks at many universities, churches, and conferences. Her book Why Trust the Bible? (published as Is the Bible Intolerant? in North America) was shortlisted for the 2006 UK Christian Book Awards, and But Is It Real? (published as Is Believing in God Irrational? in North America) was released in the summer of 2008.

  • Ravi Zacharias

    Ravi Zacharias

    Founder, Chairman and CEO of Ravi Zacharias International Ministries

    Ravi Zacharias is the Founder, Chairman and CEO of RZIM. He has spoken in over 50 countries and in many universities, such as Harvard, Princeton, and Oxford. He has addressed writers of the peace accord in South Africa, the presidential cabinet and parliament in Peru, and officers at the Lenin Military Academy in Moscow. Ravi has also spoken at the National Day of Prayer in Washington, D.C., the Pentagon, and twice at the United Nations Annual Prayer Breakfast. He has written numerous books, including the Gold Medallion winner, Can Man Live Without God. His weekly radio program, Let My People Think, is aired on almost 1700 outlets worldwide.
    Read the full biography →

  • Alister McGrath

    Alister McGrath

    President of the Oxford Centre for Christian Apologetics

    Alister McGrath is Professor of Theology, Ministry, and Education at King’s College, London, Senior Research Fellow at Harris Manchester College, Oxford, and President of the Oxford Centre for Christian Apologetics. He travels extensively to speak at conferences and missions. His writings include his acclaimed book on apologetics, Bridge Building, his widely popular Christian Theology: An Introduction and various titles on science and religion, such as A Fine Tuned Universe and The Open Secret: A New Vision for Natural Theology. He has also written a number of titles on atheism including Dawkins’ God, The Dawkins Delusion? and The Twilight of Atheism. Website:,

  • John Lennox

    John Lennox

    Adjunct Professor at the Oxford Centre for Christian Apologetics

    John Lennox is Professor of Mathematics at Oxford University, and Adjunct Professor at the Oxford Centre for Christian Apologetics. He is also a Fellow in Mathematics and Philosophy of Science at Green Templeton College, Oxford. Interested in the interface of science, philosophy, and theology, he lectures worldwide and has written books on Christian apologetics, including God’s Undertaker, Has Science Buried God?, God and Stephen Hawking, Seven Days that Divide the World and Gunning for God. In the past six years, Professor Lennox has debated a number of the world’s leading atheists including Richard Dawkins, Christopher Hitchens and Peter Singer. Website:

  • Vlad Criznic

    Vlad Criznic

    Director, RZIM Romania

    Vlad Criznic is the Director of RZIM, Romania. He grew up in a non-Christian family in the western part of Romania and became a Christian when he was 16. Ever since, he was involved with various ministries in doing evangelistic camps and events for the youth ministries of Romanian Evangelical Churches. Among them is Josiah Venture and the Romanian Missionary Society. Graduating in 2008 from the Emanuel University of Oradea with a B.A. in Pastoral Theology, following apologetics training while being an Associate of the RZIM in Oxford. Vlad is married to Dora; they live in Arad, Romania, leading the RZIM Romania, travelling through Romania and Eastern Europe in order to preach, teach and defend Christianity.

  • Vince Vitale

    Vince Vitale

    Senior Tutor at the Oxford Centre for Christian Apologetics; Tutor in Philosophy and Mission at Wycliffe Hall

    Vince Vitale is Senior Tutor at the Oxford Centre for Christian Apologetics, Tutor in Philosophy and Mission at Wycliffe Hall, a member of the Faculty of Theology and Religion at the University of Oxford, and a speaker for RZIM. He holds a Ph.D. in Philosophy and an M.Phil. in Theology, both from the University of Oxford. He has also taught at Princeton University in the Philosophy and Religion Departments. His primary research interests are in philosophy of religion, epistemology, and ethics.

  • Tom Price

    Tom Price

    Tutor at the Oxford Centre for Christian Apologetics

    Tom Price is an Academic Tutor at the Oxford Centre for Christian Apologetics, a speaker for RZIM, and an independent itinerant evangelist/apologist. He studied Philosophy at university and later completed an MA in Christian Apologetics. Before studying for his Masters, Tom worked for the University and Colleges Christian Fellowship as the founding editor of their apologetics website ( Currently, as well as his work with the OCCA, Tom is also involved with Damaris – an educational charity that seeks to help people across the world explore spiritual and moral issues underlying their contemporary culture.

  • Sharon Dirckx

    Sharon Dirckx

    Tutor at the Oxford Centre for Christian Apologetics

    Sharon Dirckx is an Academic Tutor at the Oxford Centre for Christian Apologetics. Originally from a scientific background she has a PhD in brain imaging from the University of Cambridge and has held research positions in the USA and the University of Oxford, UK. During its founding year in 2004/5, Sharon graduated from the Oxford Centre for Christian Apologetics. She has since been invited to speak and lecture in a variety of contexts and has also appeared on BBC Songs of Praise, Premier Christian Radio and BBC Radio 2.
    Her topics of interest include science and faith, suffering, and communicating the gospel with passion and relevance.

  • Frog Orr-Ewing

    Frog Orr-Ewing

    Chaplain and Missioner at the Oxford Centre for Christian Apologetics

    Frog became the youngest incumbent in the country as vicar of All Saints church in Peckham after a curacy at St Aldates Church in Oxford. Despite Peckham’s many challenges, over seven years the congregation witnessed marked growth and breakthroughs in community engagement and mission, and now numbers several hundred with youth and children’s activities to about 1000 children in the local area. Frog and Amy were sent with the Blessing of the Peckham congregation on Pentecost in May 2010 to plant Latimer Minster.

  • Michelle Tepper

    Michelle Tepper

    Evangelist and apologist for RZIM

    Michelle Tepper is an itinerant speaker for RZIM Europe and a guest lecturer at the Oxford Centre for Christian Apologetics. She is an extremely gifted communicator and Christian apologist engaging on a variety of faith issues in various forums around the UK and Europe, as well as addressing audiences across Canada and North America. Born and raised in Florida, USA, Michelle went to Oxford University to complete her degree in Political Science at New College, where she met her husband Peter, an ordained minister.

  • Tanya Walker

    Tanya Walker

    Evangelist and apologist for RZIM

    Tanya Walker is an Apologist for RZIM and a guest lecturer at the Oxford Centre for Christian Apologetics.  Her undergraduate degree was in Politics, Philosophy and Economics from Christ Church, Oxford University, and she holds an MA in Islamic Studies and a PhD which considers the implications of Islamic law in the West (both from the School of Oriental and African Studies, University of London). Tanya co-leads the Evangelists Network for the European Leadership Forum, and the RZIM Europe training weekends.

  • Christian Hofreiter

    Director of RZIM Austria, Germany and Switzerland

    Christian Hofreiter is RZIM Director for Germany, Austria and Switzerland, and a Research Fellow at the Oxford Centre for Christian Apologetics (OCCA). A native of Austria, he has studied, lived and worked in Innsbruck, Brussels, London, Los Angeles, Washington, DC and Oxford, and is now based in Vienna, Austria.