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Bill Bowerman, played by Ed O'Neill in the film Prefontaine, was the legendary track and field coach who mentored Steve Prefontaine. Bowerman's innovative training methods and unwavering support helped Prefontaine become one of the greatest distance runners of all time. O'Neill's portrayal captures Bowerman's tough exterior and compassionate nature, showcasing the coach's pivotal role in Prefontaine's remarkable career.