 He wrote the book "" and is the author or co-author of the chapters "Saurischia", "Basal Tetanurae", and "Tyrannosauroidea" in the second edition of "The Dinosauria".He has also been consulted as a scientific advisor for the "Walking With Dinosaurs" BBC series as well as the Discovery special "When Dinosaurs Roamed America", and has appeared in numerous documentaries focused on prehistoric life, such as "Jurassic Fight Club" on History and "Monsters Resurrected" on Discovery.Holtz is also the director of the Science and Global Change Program within the College Park Scholars living-learning community at the University of Maryland, College Park.