I haven't been able to find much of him teaching directly outside of this series from the Lincoln Jazz Institute [0].
However, this person has compiled a thorough overview of the underpinnings [1], provided you can ignore the diminished quality of the first few videos.
This foray into jazz actually chewed up a ton of my quarantine free time, for better or worse :)
There is an entire chapter, about 20 pages, on Harris's theories in Berkman's The Jazz Harmony Book. It's probably the best harmony book I've ever read because it's extremely down to earth and focuses on worked examples.
This is why I love HN, thank you for these links! As someone who grew up listening to crappy compressed CDs of early jazz recordings I can easily look past the poor video quality.
If you want videos, there's also this playlist from the billgrahammusic youtube channel: https://www.youtube.com/watch?v=KQgBnh9vUgI&list=PLxxPdgDHUa....