Senior Executive Team
David Viehman
Acting President and CEO
David Viehman serves as Acting CEO of American Bible Society. Holding an MDiv from Biblical Theological Seminary, Viehman has worked in direct service the church for over a decade-including as a consultant on church planting for the Metro West Presbytery, as CFO for Missio Theological Seminary, as Associate Pastor at Cresheim Valley Presbyterian Church, and currently as Moderator of the Philadelphia Presbytery. Viehman brings his strong financial acumen to this role-having worked for two decades in audit and business development at Deloitte. Serving on American Bible Society's Board of Directors since 2021, Viehman has a passion for Bible ministry and for supporting the people doing it. Viehman and his wife Elsie Viehman have been married for more than 45 years and have 3 children and 6 grandchildren.
Ovidio Alfaro
Senior Vice President, Administration and Operations
Ovidio (Ovi) Alfaro serves as the Chief Operations Officer at American Bible Society. He joined the organization in August 2021, bringing with him a broad range of experience and a passion for achieving operational excellence. Alfaro served as a Captain in the United States Army for six years of active duty. His exceptional skill in operations, management, and logistics provided the foundation for a successful career focused on helping companies reach their full potential. Before joining American Bible Society, Alfaro generated growth and streamlined operations for multiple companies, including McDonalds, Rosewood Resources, DFC Global, and Prudent American Technologies. In addition, he served as Chief Operating Officer for Bethany Christian Services, where he led ministry efforts in 36 states and 15 countries, increased operating revenues, and built partnerships and implemented programs with organizations and governments around the world. Alfaro earned his BS from the United States Military Academy at West Point. He holds an MBA with a concentration in Strategy from Texas Christian University. He and his wife, Ashley, have two adult children.
John Clause
Senior Vice President, Ministry Advancement
John Clause is Senior Vice President for Ministry Advancement at American Bible Society. He joined the organization in February 2020 and has vast experience in leading and managing relational marketing, major gift development and global philanthropy in the non-profit sector.
Clause served as Vice President of Global Philanthropy at Children International, Kansas City, Missouri. There he oversaw all relational development work, gift planning, donor communications and strategic institutional partnerships. Other positions he held include Senior Vice President of Prison Fellowship International, where he was responsible for all private fundraising channels, and National Vice President of Development and Philanthropy for World Vision. He was there for more than 17 years and oversaw all major fundraising activities in the United States.
Clause is a member of the Christian Leadership Alliance and has served on the advisory board of the National Council of Churches and the governing board of Movement.org (formerly The New York City Leadership Center).
He earned a bachelor’s degree in political science from Colgate University and his Juris Doctorate from Ohio Northern University School of Law.
John and his wife Susan have three grown children, Bethany, Sharon, and Christie, as well as two rescue dogs, Jack and Rosie.
Nicole Martin
Senior Vice President, Ministry Impact
Nicole Martin currently serves as the Senior Vice President for Ministry Impact. She joined American Bible Society in 2016 as a City Mobilizer in Charlotte, NC and later served as the Director of US Ministry, supporting Scripture Engagement efforts in cities across the US.
A former management consultant with Deloitte Consulting in Chicago, Martin has also previously served as an Executive Minister at a multi-site church in Charlotte, NC. Martin teaches courses in Ministry and Leadership Development at Gordon-Conwell Theological Seminary and is the author of two books: Made to Lead: Empowering Women for Ministry and Leaning In, Letting Go: A Lenten Devotional. Martin has authored several articles that have been featured in USA Today, Christianity Today, and The Charlotte Observer. As a nationally recognized speaker, Martin has been inducted into the prestigious Dr. Martin Luther King Jr., Board of Preachers at Morehouse College.
Martin is a graduate of Vanderbilt University with a triple major in Human and Organizational Development, Educational Studies, and French. She earned her Master of Divinity from Princeton Theological Seminary and her Doctor of Ministry from Gordon-Conwell Theological Seminary. She serves on the Board of the National Association of Evangelicals and is also a member of the Board of Trustees at Gordon College in New England.
Martin currently resides in Baltimore with her husband, Dr. Mark Martin, and their two daughters, Addison and Josephine.
