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Manny Rivera is in his ninth year as an assistant head athletic trainer with the 49ers after spending the previous 10 years as an assistant athletic trainer. This is Rivera's second stint with San Francisco after serving as an intern athletic trainer during the 2001 season.

Prior to being hired full-time in San Francisco, Rivera spent a year working with the United States Olympic Committee. With the USOC, he provided medical coverage for hundreds of Olympic and Paralympic hopefuls in track and field, softball, baseball, soccer, volleyball and rugby.