Not many footwear designers had a bigger year than David Z. buyer Ronnie Fieg in 2010. He created a can't-beat-colorway for his Asics Gel Lyte IIIs "The Coves", a sneaker that landed on many year-end best-of lists, and collaborated with everyone from Sebago to Timberland on boots and boat shoes that sold out within minutes. You may be getting to know him on Twitter (@RonnieFieg) through these releases, but R.F. has been a student of the game for years, landing his first job in the industry as a teenager at David Z., where he interacted with NYC's hip-hop and footwear elite. Yup, when it comes to sneakers, dude knows what's up. So which pair does Ronnie think is the best of all time? Click on to see him rank his favorite 50.