@LarryLarsen: My English is quite OK. I leaved in the USA for some years, and I spend at least one month every year in California. I speak English daily with my clients in the USA and with some local English-speaking clients too. Everything I write professionally is in American English. My native tongue is Brazilian Portuguese, but I also speak French, Italian, Spanish, and some Japanese.
The problem is really his Australian English. However, I manage to understand it, only that it is somewhat hard sometimes to understand Andrew when he speaks very fast. Every now and then, I rewind the video for fully understanding him. Again, one does not want to miss anything he says, for it is always very interesting and useful. He is very knowledgeable and he is, for sure, the best one in his field.