The first course added to that site is the archival version of the course site for the UCSD course BIPN 150, Diseases of the Nervous System. I served as TA for this course, and developed the class website using WordPress.
I switched hosting providers in order to have greater bandwidth and storage space, and decided that registering a new domain name for every course I taught would not be a wise use of (limited!) discretionary income. All of my future courses will therefore be at clarkbiology.com, in a subdirectory.