Jean-Luc Krieg

Founder & Global Director

Juan Sierra

Executive Director - Colombia

Emily Tamanaha

Executive Director - U.S.

David Jones

Senior Strategy Director

Oscar Garcia

Executive Director - Mexico

Noel Castellanos

Director of Strategic Growth

Carina Cova

Director of Training

Albert Chen

Director of Administration & Finance


Rev. Jean-Luc Krieg, born and raised in Ivory Coast, West Africa, and of Swiss-German descent, is Founder and Global Director of Urban Mosaic. Previously he was Latin America & Caribbean Research Team Leader for Geneva Global Inc., a Pennsylvania-based philanthropic investment firm. In that position, Krieg supervised a research team, was involved in funding and served as a consultant to dozens of non-profit organizations in Latin America, the Caribbean, Africa and Asia in the design of development and entrepreneurial strategies that produced significant economic, social, spiritual and environmental returns. Jean-Luc holds both an MBA in International Economic Development and a Master of Divinity degree from Philadelphia-based Eastern University and Eastern Seminary and is an ordained minister. Jean-Luc is presently a Ph.D. candidate at the University of South Africa. He has had an interest in working among Mexico City’s urban poor since April 1991. He lived in Mexico twice —in 1993 and 1995/96—before finally returning to Mexico in 2005 to pursue his vision of founding Urban Mosaic. Krieg has traveled to 57 countries and enjoys bridging worlds.

Oscar Rubén Garcia Reyes holds a bachelor’s in social Anthropology, bachelor’s in Political Science and Public Administration, a master’s in Social Responsibility, a master’s in Constitutional Law and Human Rights, as well as certificates in management of social projects, anti-corruption and citizen participation, and public policy advocacy. He also has a specialty in urban studies and 22 years of experience in civil society organizations directing multi-disciplinary teams. Oscar is a pioneer in the fight against the sexual exploitation of children, a trainer of civil society movements and networks of NGOs. He works toward the formation of church leaders and movements so that they would adopt a vision for holistic mission and raise their prophetic voices against injustice. He participates as an electoral advisor in the National Electoral Institute (INE) of the State of Mexico and has participated on the selection committee of the anti-corruption coordinating committee of Los Reyes La Paz. Oscar is a member of the Faith and Public Integrity Network (which is composed of leaders from around the world). He was awarded the Juvenil Ármala en Grande prize in the State of Mexico, in addition to 20 other university and government recognitions because of his support in the execution of high impact social projects, from institutions such as UNAM (the premier university in Mexico), Monterrey Technological Institute and the Anticorruption Commission in the  Mexican House of Representatives.

Juan Sierra Gaspar, born in the indigenous town San Andrés de Sotavento and raised in Montería Córdoba, Colombia, is the Executive Director of Mosaico Urbano Colombia. During the last 30 years, Juan has worked as coordinator, director and consultant for social development projects in marginalized urban communities on the Caribbean Coast of Colombia. For 10 years, he worked as project coordinator under the auspices of World Vision in Baranquilla and was the project director for the Office of Social Promotion and Development for the Association of Evangelical Churches of the Caribbean. There, he had the opportunity to accompany more than 50 churches in their social processes, 4 of which he founded. In addition, he implemented projects aimed at integral community health, strengthening civil society and high-risk youth and children. In this process of working with youth, he was invited to the General Assembly of the UN to support in developing public policy that would serve Colombian youth. Also, during the last 9 years, Juan has been a defender of human rights, consultant for organizations supporting victims of the armed conflict, and promoter for the peace process in three of the five most conflicted zones in Colombia (Montes de María, Southern Córdoba and Meta). In this process, Juan supported the creation of a law for victims and land restitution, human rights public policy, public policy and peace accords of Habana, mobilizing more than 285 civil society organizations and 600 leaders in these areas affected by the armed conflict.

Emily Tamanaha was born and raised in Southern California and is Executive Director of Urban Mosaic U.S.. Emily holds a B.A. in Public Policy and has more than 10 years of experience working in the non-profit sector managing programs, operations and teams. She was the Director of Programs and Membership for the Massachusetts Nonprofit Network, providing strategic direction and implementing the core programs, managing key stakeholders relationships, directing logistics to execute annual events with over 1000 participants, and leading a new strategic initiative that doubled the affiliate membership revenue stream in a single year. Before that, she was Program Director at Relevant Church, a start-up, multiethnic, multi-generational church that she contributed to grow from 60 to 350 during her 2-year involvement. Today, Emily is working with Urban Mosaic applying her passion to bring vision to life by developing people and operationalizing systems that will help the organization grow and scale.

David Jones is Managing Director of Cedarstone, working to help non-profit organizations, schools, foundations, and churches achieve excellence and become healthy organizations. He has now joined Urban Mosaic as Senior Strategy Director. He has led successful startup or turnaround efforts in government, business, and nonprofit organizations for decades. He served as legislative assistant in Congress, a campaign speechwriter, and as chief-of-staff at the Ohio state capitol. After serving in senior posts in government and business, David switched to nonprofit leadership, joining Scripture Union (SU). He served SU as President for ten years, beginning a lengthy partnership with SU’s Honorary President John Stott. He helped Stott launch the Langham Partnership, serving as founding President. Langham has provided Ph.D. scholarships for over 400 Langham Scholars, who now serve in influential positions such as seminary presidents and heads of national denominations around the world. During these years, Stott was named one of TIME Magazine’s “100 Most Influential People in the World.” Jones also started Geneva Global, a philanthropic advisory firm. Geneva Global has arranged hundreds of millions of dollars in funding for more than 70 clients impacting the lives of over 20 million people in more than 100 countries. Geneva Global was recently named one of the Top Ten Philanthropy Advisors in the world. He also served as Managing Director of the Lausanne Movement, founded by Billy Graham and John Stott, and as Director of Schloss Mittersill, a conference center in the Austrian Alps. David and his wife, Deb, live and work in Franklin, TN. They have three children, two sons teaching in university and a daughter in business, and three grandchildren. David and Deb travel together, interacting with nonprofit, school, foundation, and nonprofit leaders around the country and throughout the world.

Dr. Noel Castellanos has worked in full-time ministry in Latino, urban communities in the USA since 1982. He has served in youth ministry, church planting, advocacy and community development in San Francisco, San Jose, and Chicago. Noel was the founding pastor of La Villita Community Church in Chicago. In 2004 he established the CCDA Institute to equip leaders in the philosophy of Christian Community Development and served as the CEO and President of CCDA for 14 years. Noel was appointed to serve on President Obamaʼs Council for Faith and Neighborhood Partnerships, and is a speaker, motivator, and mentor to young leaders. He has a deep passion to invest in the lives of leaders committed to serving the economically vulnerable and poor in our world. Noel is the author of Where the Cross Meets the Street: What Happens to the Neighborhood When God is at the Center, co-author of A Heart for the Community, New Models for Urban and Suburban Ministry, and has contributed to various other books and publications, including Deep Justice in a Broken World, A Heart for the City, and Crazy Enough to Care. After many years of ministry focused in the USA, he has established the Camino Alliance, to invest in Latin America by building alliances across the Americas to unleash the power of faith, justicia and generosity to create the world that God intended. In this new venture, he will serve on the Global Team of Urban Mosaic as the Director of Strategic Growth. He and his wife, Marianne have been married for 35 years and make their home in Huntsville, AL. They have three grown children that live in the USA.


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