John D. Anderson Jr. is an American engineer and author known for his contributions to the field of aerospace engineering. He has written several influential textbooks, including those on fluid mechanics and aerodynamics, which are widely used in engineering education. His work has helped shape the understanding of these critical areas in aerospace. Anderson has also been involved in academia, serving as a professor at the University of Maryland. His research interests include compressible flow and aerodynamics, and he has published numerous papers in these areas. His expertise has made him a respected figure in the engineering community.