I’ll put mine into a few personal categories, an incomplete working list:
The Architects:
Eliot Noyes
Charles Eames
Eero Saarinen
Achille Castiglioni
Arne Jacobsen
The Founders:
Raymond Loewy
Walter Dorwin Teague
Brooks Stevens
Norman Belle Geddes
Jacob Jensen
The Practitioners:
Richard Seymour and Dick Powell
Hartmut Esslinger
Bill Mitchell
Dieter Rams
Giorgio Giugiaro