Christian is a German illustrator, and does work for some big name companies, and plenty of books and magazines. I like his style because it has some elements of 1950’s character design, with a little twist / edge on that look. I’m guessing he draws in Illustrator, but it could be Flash too.
If you check out his full portfolio at lindedesign.de , notice how he divides his work up by years. I think this is smart since he’s been working long enough to have a few years worth of pieces, and I’m assuming those are the best of the best from those years. So a potential client can see a few great illustrations at a time, and also realize he’s been working professionally for that many years.