Faculty & Staff

Leadership Team

Todd M. Johnson, Ph.D., Co-Director

Todd M. Johnson is the Paul E. and Eva B. Toms Distinguished Professor of Mission and Global Christianity and Co-Director of the Center for the Study of Global Christianity at Gordon-Conwell Theological Seminary. Johnson is visiting Research Fellow at Boston University’s Institute for Culture, Religion and World Affairs leading a research project on international religious demography. He is co-editor of the Atlas of Global Christianity (Edinburgh University Press) and co-author of the World Christian Encyclopedia (Oxford University Press, 2nd ed.) and World Christian Trends (William Carey Library). He is co-editor of the World Christian Database (Brill) and World Religion Database (Brill).

Contact: [email protected]

Gina A. Zurlo, Ph.D., Co-Director

Gina A. Zurlo is Co-Director of the Center for the Study of Global Christianity and received her Ph.D. from Boston University in 2017. Her research focuses on the intersection between international religious demography, world Christianity, and the history of the social scientific study of religion. She is also a Visiting Research Fellow at Boston University’s Institute on Culture, Religion and World Affairs, where she is co-editor-in-chief of the Journal of Religion and Demography and works on the World Religion Database (Brill). Click here for CV.

Contact: [email protected]

Peter F. Crossing, Data Analyst

Peter F. Crossing’s background as a professional forester in Australia has proven useful when re-applied to the task of tracking disciples of Jesus Christ in all nations. He has a Diploma of Theology (Missiology) from the Australian College of Theology at WEC’s Missionary Training College and has gained further computer mapping and database expertise through work at the Sydney Centre for World Mission, the National Church Life Survey, and Mapinfo Australia. These positions led to a role as data analyst for the World Christian Database, from which came the World Christian Encyclopedia, World Christian Trends and now the Atlas of Global Christianity. He is married with two daughters and a son and lives near Sydney, telecommuting daily to Boston’s Center for the Study of Global Christianity.

Research Associates

Bradley A. Coon, M.A.

Bradley A. Coon is a research associate at the Center for the Study of Global Christianity and was the Information Designer for the Atlas of Global Christianity. He has a BA in Biblical and Theological Studies from Gordon College, an MA in Religion with a concentration in Global Christianity from Gordon-Conwell and is currently enrolled in a Doctor of Ministry program at Gordon-Conwell. At home with his wife, Mary, in northeastern Massachusetts, Brad enjoys woodworking, scuba diving, playing guitar at church and walking their dog, Nelly.


Michael Hahn, M.Div.

A graduate of Gordon-Conwell Theological Seminary (M.Div, 2020), Michael has been with the Center for the Study of Global Christianity since 2018. Prior to his studies, he worked as an analyst in commercial real estate and led small groups for his church in Los Angeles. He also holds a BA in Political Science from UCLA. An avid writer of short fiction and creative nonfiction, Michael is currently in the MFA in Writing program at Vermont College of Fine Arts.


Hannah Nation, M.A.

Hannah Nation is the Director of Communications and Content for China Partnership (CP), a ministry working to equip Chinese house church pastors with the gospel of grace. She is currently leading multiple writing projects for CP to bring the developing theology of the Chinese house church to the English speaking world. Hannah worked for many years in international ministry to Chinese students both in mainland China and the United States. She holds a Bachelor of Arts in History from Covenant College, and a Master of Arts in Church History from Gordon-Conwell Theological Seminary. In addition to the modern Chinese church, Hannah is generally interested in the early history of American missions and the roles of women therein. She lives in Cambridge, Massachusetts.


Kenneth R. Ross, O.B.E., B.A., B.D. (Hons), Ph.D.

Kenneth R. Ross is Professor of Contextual Theology at Zomba Theological University, Visiting Professor at the University of Livingstonia and Nile Theological College, Juba, and Honorary Fellow at the Edinburgh University School of Divinity. He is a Presbyterian pastor (Church of Scotland) who has earlier served as Professor of Theology at the University of Malawi and as General Secretary of the Church of Scotland Board of World Mission. He co-edited the Atlas of Global Christianity (Edinburgh University Press, 2009). His recent publications include Ecumenical Missiology: Changing Landscapes and New Conceptions of Mission (Oxford: Regnum and Geneva: WCC, 2016) and Mission as God’s Spiral of Renewal (Mzuzu: Mzuni Press, 2019). His work with the Center is focused on co-editing the “Edinburgh Companions to Global Christianity” – a series of books published by Edinburgh University Press.

Research Assistants

Shela Chan

Shela was raised in Seattle, WA and attended the University of Washington, where she completed her BA in Asian Studies at the Jackson School of International Studies. Following a thread of involvement in international work, she interned for the Washington State Department of Commerce, worked with global health non-profit Mobility Outreach International and spent several years in export logistical work before pursuing missions. She traveled around the world with a missions program called the World Race launching in 2018. Following that, she spent eleven months in Lebanon for capacity building as a music missionary. She is currently pursuing a Master of Divinity with a focus on World Missions at Gordon-Conwell Theological Seminary. She is interested in coffee, the mystics, and endurance athletics.

David A. Hannan

David A. Hannan is from St. Albans, WV. He holds a B.A. in Statistics and English from Marshall University where he was a member of the Society of Yeager Scholars, a fellowship focused on interdisciplinary scholarship. While completing M.A.’s in Hebrew Bible and Biblical Languages at Gordon-Conwell, David has served in Hebrew and Greek teaching assistantships. He intends to pursue a PhD in Ancient Near Eastern Studies and Hebrew Bible to continue research on the intersection of historiography and religion in ancient Mesopotamia and the Levant. 

Noah Karger

Noah is from Houston, Texas, where he graduated with his Bachelor of Arts in philosophy from the University of Houston. He is currently pursuing a Master of Divinity at Gordon Conwell Theological Seminary. Noah is passionate about investigating the intersection of theory, conviction, and event.

Byington Scholar

Danielle DeLong

Danielle DeLong was born in State College, Pennsylvania, but has spent most of her life in Nova Scotia, Canada. She holds a B.A. in English from Crandall University in Moncton, New Brunswick, and is currently pursuing M.A.’s in Theology and Intercultural Studies at Gordon-Conwell Theological Seminary. She hopes to engage in the intersection between missional mobilization, cross-cultural engagement, global Christianity and the local church after she graduates. When she’s not studying, she paints with watercolor and acrylic, loves running, being by the ocean, exploring coastal towns and local coffee, and anything related to health and fitness.

Sharon Ellis

Sharon was born in Canada but grew up in Pakistan where her parents were involved in relief and development work amongst Afghan refugees. She has a background in Biblical studies, writing, and film and has spent most of the past 14 years serving overseas in one of these areas. She is currently pursuing her M.A. in Religion with a focus on world religions.

Rosell Scholar

Grace Lee

When asked where she is from, Grace identifies herself as a “Korflican,” a Korean born in the Philippines raised in an American-influenced environment. 

She graduated with a B.S. in Life Science and Biotechnology from Underwood International College, Yonsei University (Seoul, Korea).

Grace got a taste of various work opportunities in a church, a toy company, and an international school before moving to Massachusetts (her 3rd home) in the Fall of 2018 to pursue the Masters of Divinity with a focus on World Missions. During her time here, she has been involved in Student Life Services, Chapel, and other corporate worship events. Due to her multicultural and worship experiences, anything that reflects Revelation 7:9 particularly gets her EXCITED! In all that she says and does, to taste and experience God’s glory and a taste of heaven here in Gordon-Conwell is her heart and prayer. Her interests are many but she is passionate about worship, the arts, missions, healing, and Global Christianity.

Design Team

Christopher R. Guidry, Design Consultant

A graduate of the United States Military Academy (USMA) at West Point, immersed in print production experience at Last Days Ministries (LDM), and seconded from Youth With A Mission (YWAM), Christopher R. Guidry started in a 3-month position scanning images for Dr. Johnson and Dr. Barrett in the fall of 1996 for the World Christian Encyclopedia. Over the next six years, Chris migrated into page layout, print production, and other technical aspects of developing such data-heavy works. Highlights of his time include service as the associate editor of World Christian Trends, page layout for the Atlas of Global Christianity, and production assistance on various other publications. Chris, his wife, Jeanine, and their three dogs live in Richmond, Virginia.

Bryan Nicholson, M.S., Cartographer/Geographer

Bryan Nicholson is a Cartographer/Geographer working on the Design Team at the Center for the Study of Global Christianity. He is a graduate of Clemson University (B.S. in Management) and the University of Georgia (M.S. in Geography). His studies focused on cartography, geographic information systems (GIS), and cultural geography. He has designed maps and data visualizations for many organizations and publications through his project, cartoMission. He also teaches as an adjunct Geography instructor in Colorado Springs, CO.