Interesting, but you don't get the credential, of course. David Morin is a physics instructor at Harvard who has written several books based on his teaching:

Interesting, but you don't get the credential, of course. David Morin is a physics instructor at Harvard who has written several books based on his teaching: The Green-Eyed Dragons and Other Mathematical Monsters (2018) Special Relativity: For the Enthusiastic Beginner (2017) Probability: For the Enthusiastic Beginner (2016) Problems and Solutions in Introductory Mechanics (2014) Electricity and Magnetism (2013) (revision of Purcell) Introduction to Classical Mechanics: With Problems and Solutions (2008)