Back in 2013, me and two good friends Mateusz Lis (Who is now translator of comics at Egmont Poland) and Łukasz Osman (behind the camera here) meet and had an half hour interview with Mr. Don Rosa. The interview was published - translated into Polish - in a Polish magazine, but now we decided to bring it to public in it's full glory.
...gosh, my English was bad back then...
There are some sound issues but you can hear Mr. Rosa's great voice and that's what matter (if someone from Poland, we made subtitles)