Our Leadership

Wayne Speigle, Telford, PA

NPI Board Chair. Wayne has served as lead and interim pastor in several Mennonite congregations in eastern Pennsylvania and Virginia, and has been on the boards of charitable organizations and in Mennonite denominational leadership. He has studied in Israel/Palestine on several occasions.

Andrew Shadid

NPI Board Vice Chair. Andrew Shadid is the CEO of Genesis Orthopedics & Sports Medicine, a fast-growing healthcare group seeking to increase healthcare equity through care cost reduction. After graduating from Wheaton College with a focus on social entrepreneurship, he performed graduate work at the Dartmouth Tuck School of Business. At Genesis, Andrew and team are tackling the increasing problem of healthcare inequity as 25% of the United States population lacks access to adequate specialty care services. Andrew has been invited to speak on this work nationally and internationally, most notably at the United Nations Headquarters, to Members of Congress, various colleges and universities, and numerous healthcare conferences in the United States. Andrew frequently travels to the Middle East, often leading trips of students and leaders to Israel/Palestine. Andrew is married to Maryam Bighash, is father to one son (Caspian), enjoys traveling to the Middle East, and is an avid soccer fan.

Leron Lehman

NPI Board Treasurer. Leron Lehman currently serves as the Chief Operating Officer at Candoris Technologies, a provider of IT products & services. He and his family lived abroad for more than eight years in the Philippines and Niger, where he was the founding Executive Director of two pediatric orthopedic hospitals for the nonprofit organization CURE International. Prior to that, Leron was a practicing CPA and held both finance and operational leadership roles in various technology startups and in the professional services industry. A graduate of Messiah College, Leron and his wife Christine are parents to three young adult and college-aged children and currently live in Lebanon, PA.

Andrew Metzler

NPI Board Secretary. Andrew serves as the Practice Administrator for a private cardiology group near Birmingham, Alabama. His professional background is in physician practice management and health care finance and analytics. He holds a BS in Healthcare Management from the University of Alabama at Birmingham, and a Masters in Health Administration from Johns Hopkins University in Baltimore. Andrew and his wife Cecily, a Nurse Practitioner, live in the Birmingham Area.

Stefan Ateek

Stefan Ateek is a professor of social work employed at Collins College and formerly at University of Texas. His Masters of Science in Social Work (MSSW) degree was earned in 1981 the University of Texas. Stefan has more than 30 years’ experience developing and operating specialized programs in the of area of criminal justice. He was born in Nazareth where he visits frequently and maintains numerous family and professional contacts. In addition to serving on the NPI Board, Stefan is a Nazareth Hospital Ambassador in the US. He has numerous organizational involvements including the Arab America Foundation, Health Outreach to the Middle East, Arab American Friends of Nazareth and Mariam Foundation. Stefan has received numerous awards related to his board and community involvements including the “Christ Like Award” from Health Outreach to the Middle East, the Trailblazer Award from the Arab America Foundation and a special recognition as “Advisor of Probation in Texas” from Texas senator, Mike Moncrief while acting Governor for a Day. Stefan has obtained funding from foundations including Amon G. Carter, Simmon’s Family and Sid Richardson Foundations.

Lisa Burkholder

Lisa Burkholder works as a registered nurse at Sentara RMH Medical Center in Harrisonburg, VA. From 2015 – 2022 she was an Instructor of Nursing at Eastern Mennonite University where she was the coordinator for the Accelerated Second-Degree Program and the clinical instructor in Medical Surgical Environment. Earlier Lisa worked at Lancaster General Hospital from 2008-2015. Lisa received a BSN degree and a MS in Nursing: Leadership and Management from Eastern Mennonite University.

Midge Crystle, Lancaster, PA

Midge Crystle served as NPI’s Executive Director for 12 years and now on the NPI Board. She volunteered at the Nazareth Hospital in 1993 and 1995, both as an instructor at the School of Nursing and as a clinic nurse. Marjorie received her B.S. in Nursing Education from Millersville University, Millersville, PA. She is a member of East Chestnut Street Mennonite Church, Lancaster, PA.

Dr. Robert Martin

Dr. Robert Martin is a retired physician living in Wrightsville, Pennsylvania. He is a graduate of Hahnemann University and specialized in internal medicine at George Washington University. He was on the faculty of medicine at the West Virginia University Medical College for nine years and along with his wife Nancy served at the Nazareth Hospital for eighteen years between 1965 to 1995. He served first as a physician for ten years and later as General Director of the Nazareth Hospital for eight years. Since returning from Nazareth he has been in private practice in Lancaster, Pennsylvania and has served on the Nazareth Project Board for nine years. He is the father of two children and five grandchildren. He has a passion for the integration of faith and science in the practice of medicine.

Daniel Mast

Daniel Mast is an Internal Medicine Physician with experience at Indian Health Service in Arizona, as well as private practice and wound medicine. He currently works part time as a Staff Internist at Union Community Care, where he has the opportunity to care for many wonderful people who may not have access to medical care otherwise. Daniel has four adult children, and five grandchildren. He enjoys entertaining, traveling, gardening, running, bicycling, and valuing cross cultural exchange.

Terry Overholser

From 1974-1988, Terry Overholser managed businesses in Asia, Europe and Israel, and Africa-Middle East. In 1988 he returned to New York as President of the bank’s international operating subsidiary. A few years later he completed a graduate program in Counseling Psychology program at Columbia University to better understand the dynamics of growth and change in adults. After a few years practice as a family and marriage counselor Terry became COO of the 2nd largest investment consulting business in the U.S. In 1999 Terry established an independent consulting business, Management Central, Inc., to help executives and teams more effectively lead strategic and cultural change. Today he is semi-retired, accepting occasional projects of interest and doing pro-bono coaching and marital counseling.

Dorothy Jean Weaver

Dorothy Jean Weaver is Professor Emerita of New Testament at Eastern Mennonite Seminary, Harrisonburg, VA. She holds a PhD in New Testament Studies from Union Presbyterian Seminary, Richmond, VA. Her publications include The Irony of Power: The Politics of God within Matthew’s Narrative (Pickwick 2017), Bread for the Enemy: A Peace and Justice Lectionary (Mennonite Church Peace and Justice Committee, 2001), and Matthew’s Missionary Discourse: A Literary Critical Analysis (Sheffield, 1990). Weaver serves on the Editorial Board of The Journal of Inductive Biblical Studies and on the Steering Committee of MennoPIN (Palestine Israel Network). Weaver has co-led numerous Middle East study tours for EMS and numerous Nazareth/Bethlehem work groups for Virginia Mennonite Missions. And she has taught New Testament courses in Beirut, Lebanon; Bethlehem, Palestine; Cairo, Egypt; Debre Zeit, Ethiopia; and Sighisoara, Romania. Weaver sings with the Shenandoah Valley Choral Society and the Shenandoah Valley Bach Festival. She is a member of Community Mennonite Church, Harrisonburg, VA.