ops .. I found ...
it is customized: http://joel-arias.com/
This is what happens when you tinker with Optima http://www.myfonts.com/fonts/linotype/optima/ or another classic thick & thin sans...
Don
Some you may like as alternatives: Vanitas, Numskill, Simply Grotesk JNL, Stark Debonair, Seaside, Sang Bleu, Carisma, Contax Sans, Patriciana, Euro Sans, Tenor Sans, Minerva, Radiant OL, Carisma, Grenale
Captured from web.archive.org on 24 Jul 2014. view this capture
Good list of light weight thick & thin sans. Note: Tenor Sans is at https://www.behance.net/gallery/Tenor-Sans/3351597
Don