Wow, I always kind of assumed Dick Smith was just a fictional mascot like Betty Crocker, but he was a real dude. I lived in New Zealand for a short while growing up and we used to refer to Dick Smith Electronics as "Dip-shit Electronics" because the prices could be pretty outrageous. It was otherwise a pretty cool store, though; think somewhere between Radio Shack and Best Buy.
DSE was an absolute rip off, but it was pretty much the only game in town. As a kid it was an amazing place for me to spend an hour on the weekends pottering around all the electronic kitsets and latest computer parts/gadgets. I would credit DSE with fostering a lot of my love of computers and technology. I am quite sad it no longer exists.
I never got to Arngen's stores, if any, but those printed catalogues were truly amazing experiences of full on geek.
There were a lot of design similarities to Dick Smith ie the prominently featured hand drawn heads.
Today I see he has a website in his name, which is ... unique. I have no better way to describe it.