Russ openly admits that he 'struggles' with languages, having done badly with French when he was at school, and Spanish and German since. And, though he picked up certain areas pretty quickly, there were others which (let's say), were sticking points.
It was these sticking points which led to us collaborating on our 1st book: Learning Thai, Your Great Adventure. After all, we're all different when it comes to learning, but there sure are a lot of similarities and overlap.
As a technical writer, Russ also has an uncanny knack for simplifying things. Like the tone rule acronyms: considered by some to be quite difficult to master, he came up with them in 3 hours! The [very] loose story to learn the Thai alphabet order (trust me, there's neither rhyme nor reason to it), but he got it.