This month we focus on Martin Schoeller, a world-renowned portrait photographer based in New York City. Schoeller is best known for his "Close-Up" portrait series, for which he has photographed a slew of politicians, celebrities and everyday people over the last 10 years. As an editorial portrait photographer, Schoeller's clients include the New Yorker, GQ, and Rolling Stone, among others. He also has several commercial clients including Goldman Sachs, Nike and Citibank. Schoeller, who began his photographic career as an assistant for Annie Leibovitz, provides an intimate look into his work.