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Wow, it looks like there are also interviews recorded with him in his nursing home after his retirement!

https://www.youtube.com/@latintalk9556/videos

He had a lot more energy earlier in his life (of course), but you can still see a lot of his ideas and passion.

In the classroom in earlier decades he was sometimes a lot louder than this. :-)

Some of the suggested videos from that link him speaking just in Latin, which is pretty interesting:

https://www.youtube.com/watch?v=wBIZEkTKuq4 [LatinTalk: 045 Duo suadeo, duo propono]

"You don't study Liszt, you don't study Wagner, and come out hating music." [17:21]

Foster's work is based in the classical and English schooling tradition. When a boy was sent to school he would typically be introduced to the paradigms of Latin. Only having mastered it would Greek forms be introduced.