Board of directors

Petra International Ministries

Doug Knorr


Douglas Knorr lives in Traverse City, Michigan with Sally his wife of 45 years. He has been blessed with 5 children who are all serving the Lord in various capacities and 8 grandchildren. Doug is bi-vocational as the founder and CEO of Knorr Marketing, a full-service advertising agency, as well as Lead Pastor with his son Joshua at LifePoint Bible Church. Doug’s journey has included being founder of Traverse City Christian Schools, Board president of Good News Media Christian radio group in Northern Michigan, teaching at the Bible Institute in Guyana, South America as well as participating in several mission trips. Today, as president of the Petra International Ministries board, he is focused on taking the Great Commission (Matthew 28) into Nicaragua, Colombia, and beyond, and reaching those who have no hope.

Milton Whitaker

Vice President

Milt Jr. was born to a Navy family in 1949, and although raised in a Christian home, he walked away from church when he entered the Navy at age 18, vowing that he would never have kids. However, as he says, in spite of himself, the Lord gave him the most wonderful, sweet hearted woman in the world, Ann, in 1982. After being released from active duty in 1982, he spent 20 years in Federal Law-Enforcement. Milt and Ann came back to the Lord in 1999 when he began studying the Word, leading to drastic changes in his heart and life. After retirement from the law enforcement he has worked as a substitute para-educator with pre-school and elementary Special Ed. kids.  The Lord also used a trip to Nicaragua in 2004 (as he says, he went kicking and screaming) for the Lord to work another change in his heart and he has been involved with the Petra ministry in one way or another since then.

Jacob Vincent


Jacob Vincent was born in Leitchfield, Kentucky. After high school, he received a BS in Chemistry and a minor in Religion from Georgetown College. Later in 1997, he received a MD from the University of Louisville School of Medicine. After completing residency, he and his wife Lee Ann moved to Bardstown, KY, where he continues to serve as a family physician. In addition, Jacob serves as an elder at Parkway Baptist Church. He also leads a weekly bible study and participates in worship ministry. Jacob and Lee Ann have three children: Anna, David, and Sarah. Since 2011, his family has had the blessing of serving the Petra churches in Nicaragua including multiple mission trips and medical clinics.

Randy Ritsema


Randy Ritsema was born in Grand Rapids, MI. After graduating East Christian High School he went on to receive a BS degree in accounting with a business minor from Western Michigan University. In 1977 he moved to Traverse City, MI. In 1986 he opened a branch for Home Acres Building Supply and is still employed there although it is now Foundation Building Materials a public company. In 1986, he married Mary Ellen and they have 5 daughters Megan, Kelley, Emily, Molly, Joelle and a son, Brett. Megan and Kelley are married with their two grandchildren Addy and Fynn respectively. Also, Randy is an elder at the Church of Philadelphia. The whole family is physically active enjoying running, biking and boating. Over the years there have been many mission trips with each of the girls to various countries including two trips two Petra Managua and the churches on Ometepe Island.

Mark Breyer


Mark has been married for 28 years, and is very busy with five kids and five grandkids. Mark was a General Contractor and business owner prior to serving the Lord vocationally for nine years as the Director of Local and Global Missions at Canyon Bible Church in Prescott Valley, Arizona. He has had the blessing of serving and teaching all over the world in South Africa, Romania, Zambia, Philippines, Mexico, Haiti, Kenya and, of course, Nicaragua. Before joining the Board at Petra, he also served on the Board of Directors for International Ministries of Hope (Haiti) and, an Arizona based foster care and adoption ministry.