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

Michael Ramsden is the International Director for RZIM and has been part of the organisation since its foundation in Europe in 1997. He is joint Director of the Oxford Centre for Christian Apologetics. Michael was brought up in the Middle East and later moved to England where he worked for the Lord Chancellor’s department investing funds. While doing research in Law and Economics at Sheffield University, he taught Moral Philosophy and lectured for the International Seminar for Jurisprudence and Human Rights in Strasbourg. .
Read Michael’s full biography →

Amy Orr-Ewing

Amy Orr-Ewing

Amy Orr-Ewing is EMEA Director for RZIM, and Director of the Oxford Centre for Christian Apologetics (OCCA). Amy is a passionate exponent of a rational Christian response to many of the pressing cultural issues of the day, bringing her formidable theological knowledge to bear on a wide variety of subjects. She gained a first class degree in Theology at Christ Church, Oxford University, before receiving a Master’s in Theology from King’s College London. She is currently working on her Doctoral Thesis at Oxford University looking at the work of Dorothy L Sayers.
Read Amy’s full biography →

Ravi Zacharias

Ravi Zacharias

Ravi Zacharias is Founder and President of Ravi Zacharias International Ministries (RZIM), which celebrated its thirtieth anniversary in 2014. Dr. Zacharias has spoken all over the world for 43 years in scores of universities, notably Harvard, Dartmouth, Johns Hopkins, and Cambridge. He has addressed writers of the peace accord in South Africa and military officers at the Lenin Military Academy and the Center for Geopolitical Strategy in Moscow. At the invitation of the President of Nigeria, he addressed delegates at the First Annual Prayer Breakfast for African Leaders held in Mozambique.
Read Ravi’s full biography →

John Lennox

John Lennox

John Lennox is Professor of Mathematics in the University of Oxford and Emeritus Fellow in Mathematics and the Philosophy of Science. He is also an adjunct Lecturer at Wycliffe Hall, Oxford and at the Oxford Centre for Christian Apologetics, as well as being a Senior Fellow of the Trinity Forum. In addition, he is an Associate Fellow of the Said Business School, Oxford University, and teaches for the Oxford Strategic Leadership Programme. He is interested in the interface between science, philosophy and theology and his books on those topics include God’s Undertaker: Has Science Buried God?God and Stephen HawkingSeven Days that Divide the World and Gunning for God. His most recent title is Against the Flow: The Inspiration of Daniel in an Age of Relativism.
Read John’s full biography →

Vlad Criznic

Vlad Criznic

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.
Read Vlad’s full biography →

Vince Vitale

Vince Vitale

Vince Vitale is a speaker for the Zacharias Trust, as well as being Team Director and Senior Tutor at the Oxford Centre for Christian Apologetics. He is also Tutor in Philosophy and Mission at Wycliffe Hall and a member of the Faculty of Theology and Religion at the University of Oxford. Before coming to Oxford, Vince taught in the Philosophy and Religion Departments of his alma mater, Princeton University, where as an undergraduate he took an unexpected journey that led him to put his trust in God. While teaching at Princeton, Vince served as Faculty Director of the campus ministry Athletes in Action.
Read Vince’s full biography →

Tom Price

Tom Price

Tom Price is an Academic Tutor at the Oxford Centre for Christian Apologetics and an apologist for RZIM. He studied Philosophy at university and later completed an MA in Christian Apologetics. In recent years Tom has spoken at universities and churches in Hong Kong, Europe, South Africa, USA and other places across the world. In the UK, he has provided teaching for major conferences such as Keswick, Spring Harvest and BMS Catalyst. He lectures for HTB School of Theology and is regularly involved in outreach alongside OICCU and other Christian Unions. Additionally, Tom has written for various media outlets and has appeared on Premier Christian Radio’s ‘Unbelievable?’.
Read Tom’s full biography →

Sharon Dirckx

Sharon Dirckx

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 Good Morning Sunday with Clare Balding. Her topics of interest include the interface between science and faith, and suffering.
Read Sharon’s full biography →

Frog Orr-Ewing

Frog Orr-Ewing

Frog Orr-Ewing is 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.
Read Frog’s full biography →

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Tanya Walker

Tanya Walker is an Apologist for RZIM Europe and a guest lecturer at the Oxford Centre for Christian Apologetics (OCCA).  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 RZIM Europe training weekends. She has been invited to address a range of groups and contexts, including the Parliamentary Forum on Religious Freedom in Ottowa and the Global Church Forum arising from the Lausanne Congress, as well as university missions and church groups.  Tanya is married to Toby and they have a little girl called Georgia. They are based in Oxford.
Read Tanya’s full biography →

Simon Edwards

Simon Edwards

Simon Edwards is an Apologist for RZIM and Assistant Chaplain of the Oxford Centre for Christian Apologetics. He holds separate degrees in law, economics and education from the University of Queensland, Australia. He also recently completed post-graduate studies in theology at the University of Oxford. Simon brings with him a diverse experience of Christian ministry, legal, government and teaching experience. Prior to joining RZIM, Simon lived and worked in Australia as a lawyer, specializing in private practice in commercial law and in government practice in constitutional law. He also worked for two years in a secondary school as a religious education teacher.
Read Simon’s full biography →

Christian Hofreiter

Christian Hofreiter

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. From 2008-2012, Christian served with the Oxford Pastorate as a chaplain to the graduate student body at Oxford University, working closely with senior academics, leaders of various churches and a broad variety of students. An ordained Anglican minister, he was also a member of the leadership team at St Aldates church, Oxford.
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Andy Wickham

Andy Wickham

Andy Wickham is the Director of RZIM Spain, Fundación RZ para el diálogo entre fe y cultura. He studied Theology at Schloss Mittersill Study Centre (Austria), graduated from the Oxford Centre for Christian Apologetics in 2008 and earned his MTh in Old Testament Theology through UNISA. Previous to his current role, he was a staff worker for Grupos Bíblicos Universitarios (GBU) in southern Spain for nearly five years and had the opportunity of speaking on faith and apologetics and engaging in Q&A sessions in many different contexts across the country, most often to audiences of sceptic university students.
Read Andy’s full biography →

Mahlatse Winston Mashua

Mahlatse Winston Mashua

Mahlatse Winston Mashua is the Director of RZIM Zacharias Trust in South Africa. He grew up in Bushbuckridge, in the Mpumalanga Province, within a household that practiced Ancestralism (a traditional African religion). He came to know Jesus early in his life when he had a miraculous encounter during a visit to his village by itinerant missionaries. He went on to study biochemistry at the University of KwaZulu Natal, and, more recently, apologetics at the Oxford Centre for Christian Apologetics. He served as a pastor for a church in Durban for seven years where he was also involved with training the congregation in evangelism and discipleship. He regularly speaks evangelistically in many different contexts including rural villages, townships, and university campuses. Mahlatse is married to Lusanda and they live in Durban.
Read Mahlatse’s full biography →

Kosta Milkov

Kosta Milkov

Kosta Milkov is the Director of RZIM Macedonia and is the founder and Director of Balkan Institute for Faith and Culture. He earned an MA in Theology from Gordon-Conwell Theological Seminary. From 2005-2010 he lived in England where he earned the degrees of MSt and a DPhil in the field of early Christian studies and Patristics at the University of Oxford, for which he received Langham International Partnership scholarship. Kosta and his wife Nada, with their daughter Gabriela, live in Skopje Macedonia. Kosta has been involved in research work, which includes his participation in the postdoctoral research seminar organised by Langham International Partnership, the Balkan Strategy Report for the Global Scripture Impact of the American Bible Society, as well as writing numerous newspaper and magazine articles for the Macedonian press.
Read Kosta’s full biography →

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Os Guinness

Os Guinness is an author and social critic. Great-great-great grandson of Arthur Guinness, the Dublin brewer, he was born in China in World War Two where his parents were medical missionaries. A witness to the climax of the Chinese revolution in 1949, he was expelled with many other foreigners in 1951 and returned to Europe where he was educated in England. He completed his undergraduate degree at the University of London and his D.Phil in the social sciences from Oriel College, Oxford. Os has written or edited more than thirty books, including The Call, Time for Truth, Long Journey Home, Unspeakable, A Free People’s Suicide, The Global Public Square, and Renaissance. His latest book Fool’s Talk: The Recovery of Christian Persuasion was published by InterVarsity Press in June, 2015.
Read Os’ full biography →

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Jo Vitale

Jo Vitale received a first class degree in Theology at the University of Oxford and was twice recipient of the University’s Gibbs Prize for her examination results. Jo then completed a University of Oxford Masters in Biblical Interpretation (M.St) before being awarded an Arts and Humanities Research Council Scholarship for doctoral studies. She is currently using the award for doctoral studies at the University of Oxford on the topic of “Women and Beauty in the Old Testament”. Jo speaks on a variety of topics, including biblical reliability and whether the Bible is sexist. She has recently been involved in leading missions to the universities of Leeds and York.
Read Jo’s full biography →