Timothy Keller

Chairman of the Board
Manhattan, NY

Timothy Keller is Chairman of Redeemer City to City and the founding pastor of Redeemer Presbyterian Church in Manhattan, which he started in 1989 with his wife, Kathy, and three young sons. For over twenty years he has led a diverse congregation of young professionals that has grown to a weekly attendance of over 5,000.  

Dr. Keller was born and raised in Pennsylvania, and educated at Bucknell University, Gordon-Conwell Theological Seminary, and Westminster Theological Seminary. He previously served as the pastor of West Hopewell Presbyterian Church in Hopewell, Virginia, Associate Professor of Practical Theology at Westminster Theological Seminary, and Director of Mercy Ministries for the Presbyterian Church in America.

John Hutchinson

Manhattan, NY


Dr. Hutchinson most recently served for 14 years as Senior Pastor at McLean Presbyterian Church (PCA) in McLean, Virginia. During his years as Senior Pastor, John led McLean Presbyterian to partner with City to City in helping to plant several churches both in the United States and in Europe.

Before moving to McLean Presbyterian Church, John planted Christ Church (PCA) in Jacksonville, Florida and was active in helping to start a number of churches in Central Florida. He earned his Master of Divinity, Master of Christian Education, and Doctorate of Ministry degrees from Reformed Theological Seminary in Jackson, MS, and a Bachelor of Arts degree from Mississippi State University.

He is married to Cynthia and has three married adult children.



Katherine Alsdorf

Senior Fellow, Faith, Work & Leadership Initiative
Manhattan, NY 


Katherine provides consulting support and develops resources to help churches equip their people for cultural leadership.

She founded Redeemer's Center for Faith & Work in 2002 and served as its Executive Director until December 2012 where she set the vision and strategy of the Center's core programs, developed lay and staff leadership, and guided strategic partnerships. At CFW, Katherine launched programs such as the Gotham Fellows, Vocation Groups, Arts Ministries, and the Entrepreneurship Initiative.

Prior to this ministry role, Katherine spent twenty years in high tech in California and New York. She was CEO of Pensare, an online management education company; CEO of One Touch Systems, a hardware/software products company; and President of Private Satellite Network, a satellite services company.

Katherine also assisted Tim Keller in the writing of Every Good Endeavor. She lives with her husband, John, in Washington Heights and serves on the co-op board.



Al Barth

Vice President, Global Catalyst
Boca Raton, FL


Al is an ordained minister in the Presbyterian Church In America. Having planted four churches over his pastoral career, he now works primarily as a Church Planting Catalyst/Coordinator for Church Planting in major cities - helping to start new movements of churches in leading cities of Europe, Africa and North America. He has served as a coach, trainer and mentor for many global Church Planters. At present he is finishing his dissertation on "Strengthening the Influence of the Gospel in the Cities of Europe."

He and his wife, Rene, have three adult children and are grandparents to ten grandchildren.


Denine Carter


Administrative Coordinator, New York City
Manhattan, NY

Denine provides support for the NYC team and creates processes to make things run more smoothly. The best part of her job is getting planters the training they need to help them start Jesus-loving churches that serve their communities.

Denine was a hip hop dance missionary in the Dominican Republic where two seemingly unrelated things occurred: she developed a passion for church planting in urban centers, and began attending Robert Guerrero’s church. After moving back to New York, she reconnected with Robert, began working as his assistant, and helped him start a church. 

A New York City native, Denine now lives in Washington Heights and enjoys mentoring, storytelling podcasts, and, of course, hip hop dancing.

Lindsey Chasteen

Tim Cox

Manager, Digital
Brooklyn, NY

Tim Cox manages social, email, technology and this very website for City to City. 

His work in recruiting and web marketing for three Christian universities prepared him for this role. His degree in music did not.

Tim and his wife Karen live in Park Slope, Brooklyn with their four cats. 



Sarah Davis

Coordinator, Information and Research 
Brooklyn, NY


Sarah operates all the different databases that help keep Redeemer City to City on top of all their many amazing projects and inquires. This includes all past, present, and future information repositories. If you need to know something related to what we’re doing at CTC, or check out a book from our ever expanding library, talk to Sarah.

Sarah recently graduated from Pratt Institute with a Masters in Library and Information Sciences, and is this close to finishing a Masters in Jewish-Christian Studies at Seton Hall University. Originally from Virginia, Sarah has lived in New York City for over a decade, and can now look at a random street corner and tell you what used to be there before a bank moved in. In her free time, Sarah enjoys running, listening to podcasts, competing in Simpsons Trivia, spending time with friends and enemies alike, and reading an exorbitant number of books with her book club.



Katie Ellis

Program Manager, Asia Pacific
Brooklyn, NY

Katie assists with all projects facing Asia Pacific. She spends much of her time creating systems for recruiting and training church planters in cities throughout Asia. This includes coordinating trainings, managing the International Intensive in Asia and supporting CTC leaders in Asia.

Though Katie comes from a family of pastors and church planters, most of her professional background is in the arts—working with and for ceramic artists in Tennessee and Maine, managing programs for a start-up artist development non-profit organization, and—her very favorite—teaching pottery classes at a community arts studio and local high school. 

Katie lives in Brooklyn and enjoys cooking brunch, traveling to see friends and family and making pretty things with her hands.

Robert Guerrero

Church Planting Catalyst, New York City
Manhattan, NY


Robert is the New York City Church Planting Catalyst working to network with existing churches and to identify and coach new church planters.

Born to Dominican parents in New York City, Robert has spent much of his life in both the U.S. and Dominican Republic. He earned a degree in theology from Moody Bible Institute and during his studies was active in the ministry of Lawndale Community Church, Chicago, as well as planting La Villita Community Church. In 1995, Robert and his wife moved into the Colonial City of Santo Domingo where they planted Iglesia Comunitaria Cristiana (ICC) with a focus on justice and compassion for the most under-resourced in the community.

Robert is also the co-founder of the Coordinating Community of Del Camino Network for Integral Mission in Latin America with networks in Costa Rica, Argentina, Chile, Guatemala, Honduras, Nicaragua, Brazil and the Dominican Republic.



Kimberly Hunt


Director, Operations and Finance
Manhattan, NY

Kimberly's role is to manage financial and human resources operations, and ensure programs that support CTC's strategic plans are effectively executed.  Kimberly has worn different hats throughout her career but her sweet spot is managing people, processes and projects.  

Kimberly grew up in the suburbs of Orange County, CA but is a true city girl.  She's been blessed to live in such great cities such as San Francisco and Paris, but it's New York City that has captured her heart.  

She finds joy in traveling, reading, entertaining, spending time with friends and family, and finding any excuse at all to be in Central Park.  She is passionate about sharing the gospel and discipleship and considers it a privilege to be on the City to City team.

Kimberly lives on the Upper East Side in Manhattan.


Scott Kauffmann

Vice President, Content and Strategy
Manhattan, NY


Scott leads our work to create new content and campaigns to help people apply the gospel to life, ministry, and mission in the 21st century city. He is Tim Keller's lead editor.

He spent eighteen years at Accenture, serving Fortune 500 clients in the areas of strategy, human capital, technology, and large-scale program management. He coached ministry leaders for five years before coming to City to City.

Scott has lived in cities for most of his life. He loves common grace and second chances in indie music, literature, film, design, business, family, and pop culture. He is drawn to secret weapons, reluctant heroes, and late bloomers. It's all there in his songs.

He is on the board of Q, a non-profit organization educating church and cultural leaders on their role to embody the gospel in public life.

Scott and his family live on the Upper East Side of Manhattan.



Jay Kyle

Vice President, Global Catalyst
Franklin, TN


Jay is the Director and City Catalyst of Church Planting in Asia as well as Intercultural Church Planting in New York City. His responsibilities include recruiting, mentoring and coaching church planters in the megacities of Asia.

Jay attended high school in Manila, Philippines and graduated with a BA from Belhaven University in Jackson, Mississippi. He received an MDiv from Reformed Theological Seminary in Jackson, Mississippi.

He served for thirty-two years as a missionary with Mission to the World (MTW), the overseas mission arm of the Presbyterian Church in America. During those years he worked with Wycliffe Bible Translators in Papua New Guinea; founded MTW's Short-term Missions Program; served as MTW's Personnel Director, as their church-planting team leader in Mexico City, and as Field Director for Mexico and Central America.

Jay serves on the Boards of Belhaven University and the Asian Charity Services in Hong Kong.

Jay and his wife, Maureen, live in Manhattan and have three grown children and six grandchildren.



Ruth Leary

Regional Network Coordinator, EMEA
Manhattan, NY

Ruth supports the work of church planters in Europe, the Middle East and Africa. She helps connect church and network leaders in those regions to City and City. 

Born in Richmond, VA to missionary parents, Ruth spent half of her formative years in Kiev, Ukraine. Living in Eastern Europe gave Ruth a passion for connecting with people of different cultures. She loves getting to be a part of the growth of the global church. 

Ruth graduated from the University of Virginia where she studied Foreign Affairs and Russian and Eastern European Studies. She loves mountains, road trips with friends and good coffee. 

Clara Lee

Manager, Content
Manhattan, NY


Clara works on publishing projects based on the work of Timothy Keller and Redeemer Presbyterian Church. She handles publisher relations, licensing and permissions requests, and foreign translations with publishers, agents, and ministries around the world. She also assists with Redeemer City to City’s events and conferences.

Clara previously worked at Nature Publishing Group, where she worked in customer service and operations for the site license business unit, and spent a year with a mission in Trujillo, Peru's third largest city. She has a passion for cross-cultural communication and resourcing leaders in other parts of the world.

Originally from Southern California, she graduated from NYU with degrees in History and Economics and has been a member of Redeemer Presbyterian Church for over ten years.


Melanie Penn

Director, Marketing
Brooklyn, NY


Melanie Penn joined the City to City team after a decade of touring with Broadway shows and working on the publishing side of Vogue magazine. She is a native Virginian and comes from a long line of Presbyterian church planting preachers from the midwest. Before them, she descends from some spiritual radicals who sailed to North America on the Mayflower.

She considers it a privilege to live in New York City, to be a part of CTC and to work with heroic people all over the world. She produces most training and development events in New York City and North America and also oversees creative and promotional materials generated by CTC.

Melanie lives in Brooklyn and is also a professional worship leader and singer-songwriter.


Nicole Pietrini

Mark Reynolds

Vice President, Operations and Leadership Programs
Manhattan, NY


Mark serves as Vice President of Operations and Leadership Programs providing oversight of church planter training, assessment, coaching and funding as well as bringing new CTC initiatives to market. He also provides leadership to the Church Multiplication Alliance of NYC that is committed to planting churches throughout the city through a trans-denominational alliance and various networks.

He is passionate about creating learning programs that further develop leaders to reach their vision of planting new urban congregations and resourcing them through coaching, training and feedback.

Before serving in this current position he was the field director with Mission to the World in Manila facilitating church planting with Filipinos. Mark has also helped plant a church in Columbus, Ohio, served as campus staff with Campus Crusade at Oregon State University, and holds graduate degrees from Covenant Seminary, Aberdeen University and Saint Louis University.

Mark lives with his wife and two sons in Manhattan, all of whom share common affinities for reading, sports, and love for NYC.


Ru Sen


Regional Director, India
Orlando, FL

Ru recruits, trains and resources church planters in Mumbai, New Delhi, Kolkata, Chennai, Bangalore and Pune. Ru's family is from India, and he is thrilled to work strategically for the spread of the gospel in this amazing country. 

Ru hails from Chapel Hill, NC and earned an M.Div. from Reformed Theological Seminary. He is married to Kim and has two children, Jacob and Lily. 

Ruben Soto

Program Manager, NEW YORK CITY
Brooklyn, NY


Ruben comes to us from being the Director of Ministry Relations at Nyack College, where he developed partnerships between the college and area churches. He also spent several years as an active lay leader at Brooklyn Tabernacle.

Ruben is working on his MA in Biblical Studies from Gordon-Conwell Theological Seminary and lives in Bay Ridge, Brooklyn.



John Thomas

Director, Global Training
Manhattan, NY


John Thomas is the Director of Global Training for City to City.

He is responsible for designing and delivering many of our training experiences for CTC, both in New York and in other global cities. From 2008-2011, he has written and field-tested CTC's Incubator, a transformational training system for urban church planters. His vision is to develop a global cadre of trainers who collaborate in the service of gospel church planting in every city in which we work.

John has been involved in ministry training and church planting overseas, as well as in the US, most recently planting Church of the Redeemer in Atlanta.

John earned a Ph.D. in anthropology with an emphasis in adult education and spiritual formation, and continues to be intrigued by how epistemology, ethos, and cultural values impact the quest to know God and each other.

He is married to Shari, founder/director of Parakaleo, a ministry dedicated to the care and nurture of church planting couples. They live on the Upper West Side of Manhattan.



Doug Thorson

Vice President, Advancement
Manhattan, NY

Doug leads the advancement efforts that support CTC's rapidly growing, global footprint.

He brings over 15 years of experience in developing key partnerships for charitable impact organizations and two decades of experience in communications, strategic selling, and business planning. He views his role as a calling to help faithful stewards grow in generosity. 

Doug is married to Susan and they have four children. After 28 years in Virginia, they are relocating to New York City. 

Stephen Um


Associate Training Director
Boston, MA

Stephen Um (Ph.D., University of St. Andrews) is the senior minister of Citylife Presbyterian Church in Boston, MA. He teaches New Testament studies at Gordon-Conwell Theological Seminary, and serves as a council member with The Gospel Coalition.

For the past 25 years, Stephen and his wife, have been involved in several Presbyterian Churches throughout the Northeastern part of the country. He is the author of The Kingdom of God, Why Cities Matter (Crossway, 2013) and the forthcoming commentary on 1 Corinthians from the Preaching the Word series (2015). His sermons and resources are available online at The Center for Gospel Culture.

Gary Watanabe

Director of Coaching, Asia Pacific
Tokyo, Japan


Gary and his family first got involved in church planting as part of a core team in Hawaii in 1980. Soon after that they were called to cross-cultural church planting with the foreign missions arm of the Presbyterian Church in America, called Mission to the World.

He and his family have been involved in church planting, training, mentoring and coaching in Mexico City, Monterrey, Mexico, and Manila, Philippines before joining City to City. Gary's current role is to assist in the training, coaching, and networking among the different ethnic church planters within New York City and in other global cities of the world with whom they partner.

Gary and his wife, Lois, have been blessed with 3 grown children.


David Whitehead

Coaching Catalyst, New York City
Manhattan, NY

David has been involved in helping church plants for over 30 years. He and his wife, Kathleen, moved to New York City in 2003 specifically to plant churches. During that time, David has been a part of pioneering 3 church plants, including his current congregation, Grace, which meets on the Upper West Side and is planting another church in Queens. 

David has been coaching church planters throughout his time in Manhattan. He studied at Reformed Theological Seminary and Fuller Seminary. David also served as a chaplain at Duke University and the University of North Carolina at Chapel Hill at the same time. He has been certified by CoachNet, Gospel Coach and Church Multiplication Ministries. David, his wife and his two daughters live on the Upper West Side of Manhattan. His hobbies include trying to find time, cycling and playing guitar. 

Walter Wood

Assistant Director, Global Affiliates
cincinnati, OH

Walter Wood's ministry career has taken him through campus ministry with Cru, seminary (M.Div., D.Min.) in Jackson MS, a 12-year stint at Perimeter Church in Atlanta, and founding and Sr. Pastor of North Cincinnati Community Church in Mason, Ohio.

He and his wife Becky planted the church in 1994, and over the 21 years, NCCC grew and was able to plant 8 other churches in the Cincinnati area and beyond.  Walter has been working with City to City as an adjunct field staff during his last three years at North Cincinnati, in several cities in Southern Europe, and now has been taken on by CTC in a full-time capacity as Assistant Director of Global Affiliates.

Walter’s responsibilities are to coach church planters in Europe and to develop partnerships between North American churches and CTC’s target cities.

Walter is married to Rebecca and they have two grown children and three grandchildren.

Regional Director, Partner Engagement
Dallas, TX

Mario Zandstra

Mario helps share the vision of City to City to constituents in Texas and its neighboring states.

He has had a distinguished career in commercial real estate in Dallas, and most recently served as CEO of Pine Cove Camps. Mario led Pine Cove to become one of the largest Christian camps in the United States hosting over 80,000 campers per year at their nine residential camp locations.

Mario was born in the Hague, Netherlands and was raised in Los Angeles. He attended the University of Southern California Business School and moved to Dallas after college to work in commercial real estate. 

Now, Mario and his wife Lynelle have seven children and live in the University Park area of Dallas. They are members of Park Cities Presbyterian Church.