After the Navy, he completed a Degree in Business Administration at Point Loma College in San Diego. After graduation, he joined the staff of the Navigators and began ministering on the Campus of San Diego State for six years and then moved to the University of Oregon for seven years.
In 1989, the Navigators formed a joint venture with Multnomah Bible College and began Mission Portland. During this time Dennis gained much experience in working with pastors and churches in prayer and disciple making.
From 1999 to 2004 he took on leadership roles at Greater Portland Bible church and assisted Lynn Kent, the Senior Pastor, as Executive Pastor.