Dr. Pier moved to New York from South Dakota in 1984. He served for thirteen years with InterVarsity Christian Fellowship overseeing 15 campuses as Area Director and spoke at the 1993 and 1996 Urbana Mission Conferences.
In 1988, Mac founded Concerts of Prayer with colleagues from Here’s Life Inner City. To date, more than 250,000 people from 2,000 churches have participated in the Metro NYC prayer movement.
Dr. Pier and Dr. Tim Keller, co-founded the Church Multiplication Alliance in 2003. Its emphasis on united prayer and church planting was a catalyst for the 500% growth of evangelical Christianity in Manhattan from 1989-2014
In 2008, responding to the expressed needs of local pastors and leaders, Dr. Pier founded The New York City Leadership Center (renamed Movement.org in 2018). Movement Day began shortly thereafter in 2010. Since then leaders from 400 cities and 95 countries have participated in Movement Day Expressions with new cities being added monthly. Movement.org is currently tracking with leaders in 500 cities globally.
Mac also serves the Lausanne Movement as Co-Catalyst for Cities.
Dr. Pier earned his Master of Arts degree in religion from Trinity Evangelical Divinity School and his doctorate at Palmer Theological Seminary. He is the author/co-author of 10 books including the series – A Disruptive Gospel, A Disruptive Generosity, and A Disruptive God. A Disruptive Gospel was named an outreach resource of the year by Outreach Magazine in 2018. Mac also wrote The Power of a City at Prayer on the one-year anniversary of 9/11. His most recent book is Required with Bishop Claude Alexander
Mac and Marya have lived in New York City for 39 years. They have three married children and five grandchildren.