There are so many.
I admire my old teacher Dick Isbell.
I'm a huge fan of the classic designers: Josef Muller Brockmann, Paul Rand, Wim Crowell, Doyald Young, Willi Kunz, Karl Martens, etc.
Of my contemporaries, Dan Mall, who I've worked with and is a very nice guy, Jason Santa Maria, Jesse Bennett Chamberlain, are some of my favorite contemporary interactive designers. Jessica Hische's type design is amazing, and Eric Strohl's logo work is great. There are a ton of others...
I've always been very fond of The Designers Republic and really enjoy the work of Mutabor, but there are others...
Stefan Sagmeister, Si Scott, Marian Bantjes, Lance Wyman, Herb Lubalin.
Locally, I admire the work from Arlo, Someoddpilot and We Cant Stop Thinking, among others.
Nationally, I admire the work from Eight Hour Day, Studio On Fire, Area 17, Mucca Design and 160over90, among others.
Benny Gold , Revok1 , Rime msk, kaws, nike, alex pardee
I love pop art. It makes sense and I can relate to that. Andy Warhol was a genius.
giovanni bianco, joshua davis, adelle charles
All those who do their work qualitatively
Wim Crouwel, Mark Farrow, Johnson Banks and Moving Brands to name but a few!
Mies van der rohe, who showed me how to appreciate and embrace minimalism.
Robert Lindström - www.designchapel.com
Si Scott - www.siscottstudio.com
Natalie Ratkowski - www.floaty.de
and many, many others
In past, there's alot amazing designers :)