This appears to be an (illegitimate?) republishing of a course that Dan Armendariz has taught at the Harvard Extension School since 2008. (The course number has since changed from CS E-7 to Digital Media E-10.) You can find the fall 2015 materials available online for free, better-organized and without advertising, at http://digitalphotography.exposed.

If you find these materials helpful, or want feedback on your work, consider enrolling in the course through the Extension School [0]! Part of your tuition inevitably supports the Harvard bureaucracy, but Dan and his teaching fellows's stipends are directly tied to the number of students who enroll in the course, and they've kindly made the entire course available for free. You can also apply that course credit to an Extension School degree, which is worth more than whatever certificate of completion Alison is providing.

[0]: https://www.extension.harvard.edu/academics/courses/exposing...

Edit: I suppose I should note that the instructor for the current Extension School offering appears to have changed in the last year, so your mileage with the current version of the course will vary.