E30 was designed by Claus Luthe as well. It's under his wikipedia discription:
"The next priority was the development of a successor for the E21 3-series.
In order to broaden the appeal of the model, a four-door version was to be added.
Luthe maintained a low front profile and the familiar dual round headlights in the E30 successor model,
distinguishing the model from the larger 5-series, while creating a smoother profile, as with the E28."