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David Harris, author of "The Genius: How Bill Walsh Reinvented Football and Created an NFL Dynasty," discusses his book and the legacy of a coach who revolutionized the NFL. Gelf Magazine presents Varsity Letters, a free, sports centric reading series every month at the Happy Ending Lounge in New York. February 5's installment featured David Harris, Will Leitch, and Jon Wertheim. Harris is the biographer of legendary 49ers coach Bill Walsh. Leitch shared all-new material from the paperback edition of his manifesto on behalf of the modern fan. And Wertheim profiled a mixed-martial arts legend and the meteoric rise of his sport. You can order copies of their books through Gelf’s website; for interviews and more, visit www.gelfmagazine.com