I went to art school with these two guys: sporkdesign.com.
There are, of course, many illustrator/designers out there. Sometimes marketing yourself as being versatile can be very beneficial. If you can pull it all off, that is. You obviously need to be at least decent in both disciplines, but most artists are stronger at one than they are at the other. I know of almost nobody in the world that is both an A+ designer AND an A+ illustrator. And after these two fellows, I can't think of anyone. Unbelievable talents that really do make it look easy.
No, I take that back. They make it look hard. For me, at least, because when I look at their work, I say to myself, "#@&!! How do they DO that!?"