No, I am not talking about myself. I am talking about David McMahon who has written a large collection of excellent introductory pedagogic undergraduate textbooks, most of which in the "Demystified" series, on physics, mathematics, and other related stuff. The topics on which he has written books range from Biochemistry to String Theory, which is impressive by itself. For a more complete list of his books see https://www.amazon.com/David-McMahon/e/B001H6O0UW I have been reading several of his books, and I more than liked them. Are there any other fans of him and his work?