Rev. Ahrens has preached in churches across the country and has served as preacher of the week in Chautauqua, NY; Lakeside, Ohio and Bay City, Michigan. He has preached, lectured and taught at Yale Divinity School and Chicago Theological Seminary. He has preached at the MAAFA celebration at St. Paul's Community Baptist Church in Brooklyn, N.Y. In October 2011, he spoke and offered a eulogy at a home-going celebration for the Rev. Dr. Fred Shuttlesworth in Birmingham, Ala.