Erik Demaine has some of the nicest algorithms lectures, and I would compare him to Gilbert Strang teaching linear algebra. EDIT: and closer to here, cpercival

Erik Demaine has some of the nicest algorithms lectures, and I would compare him to Gilbert Strang teaching linear algebra. EDIT: and closer to here, cpercival talking about cryptography and security, or tptacek when he's not grumpy and actually writes an informative, detailed comment.