I’m Lester Lee (he/him/his). I’m a computer science educator based in NYC. My email is edu@lester-lee.com – feel free to reach out! I’m always happy to chat about education, and I’m more than willing to elaborate on anything you find below.


Links point to the most recently updated website for the respective course. Materials for non-linked courses can be found on Github.

Core Courses



My most up-to-date materials can be found on Github.

More worksheets can be found on Google Drive.