Jock Semple

John Duncan "Jock" Semple (October 26, 1903 – March 10, 1988) was a Scottish-American runner, physical therapist, trainer, and sports official. In 1967, he attained worldwide notoriety as a race official for the Boston Marathon, when he attempted to tear off the number of Kathrine Switzer, who was officially entered despite a ban on female competitors. He subsequently oversaw implementation of qualifying times in 1970 and the formal admission of female runners in 1972.

Semple was born in Glasgow, Scotland and emigrated to the United States in 1921 to work as a cabinetmaker in Philadelphia. He moved to Boston after running in his first Boston Marathon and began to work in sport-related fields. He was a masseur and physical therapist for the Boston Bruins and the Boston Celtics, and a trainer for Olympic athletes.

Semple became known to a lay audience while working as a Boston Marathon race co-director. He had been in the long-time habit of physically attacking those he perceived to be "non serious" runners competing in the race, whether officially entered or running the course unofficially. In a 1968 interview with Sports Illustrated, he called them "These screwballs! These weirdies! These MIT boys! These Tufts characters! These Harvard guys!" According to fellow race official Will Cloney: "He hurls not only his body at them, but also a rather choice array of epithets... Jock's method of attack is apt to vary." In 1957, Semple had narrowly escaped arrest for assault after attempting to tackle a runner in swim fins and a snorkeling mask. In the 1967 Boston Marathon, one woman, Bobbi Gibb, ran and finished unofficially, as she had the previous year, because women were not allowed to participate. When another, Kathrine Switzer, entered the race officially, through an "oversight" in the entry screening process, Semple tried to stop her as she ran. Switzer wrote in her memoir "A big man, a huge man, with bared teeth was set to pounce, and before I could react he grabbed my shoulder and flung me back, screaming, 'Get the hell out of my race and give me those numbers!'" Switzer's boyfriend managed to shove Semple aside. Photographs of Semple attempting to rip Switzer's number off were widespread in the media.

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