Thomas Sullivan (N/A–) is an American Reformed Baptist preacher and pastor, best known for his ministry at Grace Bible Church in Grand Rapids, Michigan, and his expository sermons available on SermonAudio. Born in the United States, likely in the mid-20th century based on his preaching timeline, specific details about his early life and exact birth date are not widely publicized. Raised in a context that led him to embrace Reformed theology, he pursued a calling to ministry, though his educational background—potentially including seminary training—remains undocumented in public records. Sullivan’s preaching career centers on his role as pastor at Grace Bible Church, where he has delivered messages emphasizing biblical inerrancy, Calvinistic doctrine, and practical Christian living. His sermons, such as those on the Puritans, Baptist history, and personal testimonies (e.g., “A Testimony of Grace” and “The Puritans”), reflect a deep engagement with Scripture and church heritage, often drawing from his own conversion story, which he credits to God’s grace breaking through a period of spiritual struggle. Active on SermonAudio, his ministry extends beyond the pulpit through online platforms, reaching a broader audience with a focus on Reformed Baptist distinctives. Married with a family—though specifics are private—he continues to serve in Grand Rapids, leaving a legacy as a preacher of theological depth and pastoral care within his community.