Mark Dever is an American pastor, theologian, and author known for his leadership at Capitol Hill Baptist Church in Washington, D.C.. He is a prominent figure in the Southern Baptist Convention and has contributed significantly to discussions on church health and biblical preaching. Dever is also the founder of 9Marks, an organization that aims to promote healthy church practices. He has written several books on church life, theology, and pastoral ministry, emphasizing the importance of sound doctrine and the role of the church in the community.