Contributors

• 

  Jana Harmon

  Senior Fellow For Christian Apologetics, CSLI
×
Team Members

Jana Harmon
Senior Fellow For Christian Apologetics, CSLI
Jana Harmon, Ph.D, is the Senior Fellow For Christian Apologetics for the C.S. Lewis Institute and a Teaching Fellow for C.S. Lewis Institute Atlanta. She serves on the Atlanta Advisory Board and as an Adjunct Professor of Cultural Apologetics at Biola University. Her doctoral research studied the religious conversion of atheists to Christianity looking at the perspectives and stories of 50 former Atheists. She views apologetics through a practical, evangelistic lens. She is the host of the podcast eX-skeptic for the C.S. Lewis Institute. Jana received her PhD from the University of Birmingham, England.
 
• 

  Olivier Bonnassies

  Engineer, Entrepreneur, and Author
×
Team Members

Olivier Bonnassies
Engineer, Entrepreneur, and Author
Olivier Bonnassies is a French engineer, entrepreneur, and author with a background in both science and theology. Educated at the prestigious École Polytechnique in Paris, he spent years building successful companies before turning his attention to life’s deepest questions. Once an agnostic, convinced that belief in God was irrational, Olivier embarked on a personal investigation that led him to faith in Christ. He is co-author, with Michel-Yves Bolloré, of God, the Science, the Evidence: The Dawn of a Revolution, a bestselling book in Europe (over 400,000 copies sold) now launching in the U.S. Through his research and writing, Olivier argues that the convergence of science, philosophy, and history reveals a compelling case for God’s existence.
 
• 

  Kathleen Noller

  Questioning Belief Podcast Host, CSLI
×
Team Members

Kathleen Noller
Questioning Belief Podcast Host, CSLI
Kathleen Noller, Ph.D, is a Senior Fellow for the C.S. Lewis Institute and the host of the Questioning Belief podcast. She is a leading Computational Biologist and specializes in cancer research. Kathleen completed her undergraduate studies in Biomedical Engineering at Columbia University, where her academic journey laid the foundation for her career as a scientist. She holds a PhD from Johns Hopkins University and is passionate about medical research. Kathleen is also a dedicated wife and mother to a one-year-old, balancing her professional achievements with the joys of family life.
 
• 

  Sita Slavov

  Professor
×
Team Members

Sita Slavov
Professor
Sita Slavov holds a Ph.D. in economics from Stanford University and is a professor of public policy at George Mason University. She has published numerous peer-reviewed articles, book chapters, and policy briefs on economics and public policy. She has also published op-eds in The New York Times, The Los Angeles Times, and wrote an article for Christianity Today in 2023 titled “Unable to find ultimate truth in Zen Buddhism, I turned to Jesus.”
 
• 

  Heather Tomlinson

  Journalist
×
Team Members

Heather Tomlinson
Journalist
Heather Tomlinson is a British journalist and writer who spent much of her career working for national newspapers in the UK, including The Guardian. Trained in molecular biology, she began her career reporting on science and technology before moving into psychology and mental health. A one-time secular liberal, Heather’s pursuit of truth led her through science, politics, and spirituality until she found the love and reality of Jesus Christ. Today, she writes for Christian publications and serves in pastoral care, helping others discover faith and healing through God’s love.
 
• 

  N. Gray Sutanto

  Professor and Author
×
Team Members

N. Gray Sutanto
Professor and Author
N. Gray Sutanto holds a PhD from the University of Edinburgh and is assistant professor of systematic theology at Reformed Theological Seminary, Washington, D.C. He is the author of God and Knowledge, co-author of Neo-Calvinism: A Theological Introduction, co-editor for Herman Bavinck's Philosophy of Revelation, and author of A Sense of the Divine: An Affective Model of General Revelation from the Reformed Tradition. His research interests include Dutch Reformed theologian Herman Bavinck, humanity and sin, and Christianity and culture, among others.
 
• 

  Stephen Iacoboni

  Oncologist, Speaker & Author
×
Team Members

Stephen Iacoboni
Oncologist, Speaker & Author
Stephen Iacoboni, MD, is a veteran oncologist, author, and speaker whose medical career spans more than forty years. Trained during an era dominated by scientific materialism, he once embraced an atheistic worldview. But through decades of walking with cancer patients in their deepest suffering, he rediscovered the reality of the human soul and the hope of faith. He is the author of The Undying Soul: A Cancer Doctor’s Discovery and Telos: The Scientific Basis for a Life of Purpose, where he shares both his personal journey from atheism to faith and his case for meaning and design in life. Today, Dr. Iacoboni continues to write and speak on the intersection of science, medicine, and spirituality, encouraging both doctors and skeptics to see beyond a purely mechanistic view of life.
 
• 

  Chris Sicks

  Pastor
×
Team Members

Chris Sicks
PastorChris Sicks is pastor of One Voice Fellowship in Northern Virginia. He previously served on staff at Alexandria Presbyterian Church in Virginia for 20 years. He is a graduate of Reformed Theological Seminary and the author of Tangible: Making God Known through Deeds of Mercy and Words of Truth. He is founder and board president of For the Nations DC, offering English classes to refugees and immigrants four days a week, to help our new neighbors acclimate and discover the truth and love of Jesus. He’s been a newspaper editor, restaurant manager, and Army officer.  
• 

  Andy Bannister

  Author
×
Team Members

Andy Bannister
Author
Andy Bannister is an author, speaker, and broadcaster. He is currently the Director of the Solas Center for Public Christianity, an evangelism and training ministry, as well as the Adjunct Research Fellow at Arthur Jeffery Centre for the Study of Islam at Melbourne School of Theology. He holds a PhD in Islamic Studies and has taught extensively at universities across the world on both Islam and Philosophy. Andy speaks regularly on Christianity to audiences of all faiths across Europe, Canada, the US, and further afield. He is an author of several books including: The Atheist Who Didn't Exist, Do Muslims and Christians Worship the Same God? and most recently, How to Talk About Jesus Without Looking Like an Idiot.
 
• 

  Aimee Riegert

  CSLI Fellow
×
Team Members

Aimee Riegert
CSLI Fellow
Aimee Riegert, CSLI Fellow, earned bachelor’s degrees in mathematics and foreign language studies from Southern Methodist University. In addition to supporting various national security efforts in Northern Virginia, she has worked as an itinerant high school math teacher and drama coach, and has served in women’s ministries, praise teams, on the adult support team for Young Life and as a “mentor mom” for MOPS International ministries, as well as English instructor in several ESL programs in Japan. She is a graduate of the C.S. Lewis Institute Year One Fellows Program.
 
• 

  David B. Calhoun

  Professor
×
Team Members

David B. Calhoun
Professor
David B. Calhoun, (1937-2021) was Professor Emeritus of Church History at Covenant Theological Seminary in St. Louis, Missouri.  A minister of the Presbyterian Church in America, he has taught at Covenant College, Columbia Bible College (now Columbia International University), and Jamaica Bible College (where he was also principal).  Calhoun has served with Ministries in Action in the West Indies and in Europe and as dean of the Iona Centres for Theological Study.  He was a board member (and for some years president) of Presbyterian Mission International, a mission board that assists nationals who are Covenant Seminary graduates to return to their homelands for ministry.
 
• 

  Caleb Ball

  Podcast Guest
×
Team Members

Caleb Ball
Podcast Guest
Caleb Ball is a former atheist turned passionate Christian communicator. Once a vocal critic of Christianity, known online as “Crazy Caleb” during his atheist YouTube years, he now uses his platform to share testimonies of skeptics who found faith in Jesus. Through his YouTube channel Aspiring Christian, he curates conversion stories and apologetics content to help others wrestle honestly with life’s biggest questions. Caleb holds a degree in history and is pursuing a Master’s in Biblical Studies at Colorado Christian University. He and his wife live in Montana, where they are active in their local church and community.
 
• 

  Thomas A. Tarrants

  Author, President Emeritus, CSLI
×

Team Members



Thomas A. Tarrants

Author, President Emeritus, CSLI

Thomas A. Tarrants is President Emeritus of the C.S. Lewis Institute. After serving twelve years as president and nine years as vice President, he retired from his position as Vice President for Ministry and Director, Washington Area Fellows Program, with CSLI in June 2019. He holds a Master's of Divinity Degree, as well as a Doctor of Ministry Degree in Christian Spirituality. Tom is an ordained minister in the Evangelical Church Alliance and a member of the Evangelical Theological Society. He spends his time writing, mentoring, consulting and traveling. His life story is told in Consumed by Hate, Redeemed by Love, published by Thomas Nelson Publishers.