[3] Born in Macon, Georgia,[2] Hennings has lived in New York City, San Francisco, and Los Angeles for much of his acting career.
His cinematic roles include Caddo Lake with Dylan O'Brien, The Neon Highway with Beau Bridges and Rob Mayes, Four Good Days with Glenn Close and Mila Kunis, The Work and the Glory trilogy, Martin Scorsese's The Aviator with Leonardo DiCaprio, Havoc with Anne Hathaway, Drop Zone with Wesley Snipes, Pawn Shop Chronicles with Paul Walker, Brendan Fraser, Norman Reedus, and Elijah Wood, Shout with John Travolta, Seasons of the Heart, Point Last Seen with Linda Hamilton, Final Shot: The Hank Gathers Story with George Kennedy, and Gideon Oliver: The Last Plane from Coramaya with Louis Gossett Jr., among others.
He had recurring roles on the CBS series JAG, Resurrection Blvd., and in Pensacola: Wings of Gold as the brother of James Brolin's character.
In 2007, he had a recurring guest role on the TNT series Saving Grace as the brother of Holly Hunter's character.
From September to October 2003, he appeared in the Los Angeles Theater in the play Ten Tricks, about a brothel madam and a magician.