Harry Mozley Stevens^{[lower-alpha 2]} (June 14, 1855 – May 3, 1934) was a food concessionaire from England credited with being America's foremost ballpark concessionaire.^[3] He is also attributed by various sources as being the inventor of the hot dog.^[4][5][3]

Stevens was born in Derby, England, in 1855 and had connections to Litchurch there. He emigrated to Niles, Ohio, in the United States in 1882.^[2] He was first employed as an ironworker, then as a traveling book salesman.^[2]

In the late 1880s, Stevens traveled to Columbus, Ohio, and attended a baseball game.^[2] He found the scorecard he was sold to be deficient, and quickly made his mark by designing and selling a version with a illustration on the cover, player names and positions listed inside, and an advertisement on the back, a design still in use.^[2] He sold his scorecards to fans using the phrase "You can't tell the players without a scorecard."^[3] Over time, he expanded to Toledo, Milwaukee, and Pittsburgh,^[2] and also founded Harry M. Stevens Inc., a stadium concessions company. In the mid-1890s, he expanded to New York City after meeting with John Montgomery Ward, then-manager of the New York Giants.^[2] By 1900, Stevens had secured contracts to supply refreshments at several major-league ballparks across the country.

Stevens claimed that at a Giants' home game on a cold April day in 1901,^{[lower-alpha 3]} there was limited demand for ice cream so he decided to sell German "dachshund sausages", having his staff place them in bread rolls and sell them as "red hots".^[3] Newspaper cartoonist Tad Dorgan,^[6] reportedly recounting the event, was said to have been unable to spell dachshund, so wrote "hot dogs" instead.^[3] This account has been disputed by researchers, who point out the earliest known hot-dog cartoon by Dorgan dates to 1906,^[7] and "the term 'hot dog' was used for sausages in buns as early as 1895 in college newspapers."^[8]

Stevens died in May 1934 in Manhattan following two bouts of pneumonia;^{[lower-alpha 4]} he was survived by his wife and five children.^[9]

Harry M. Stevens Inc. was acquired by Aramark on December 12, 1994.^[10]

Stevens Park in Niles, Ohio, which opened in 1936, was named in his honor after his family donated its 35 acres (14 ha) to the city.^[11] In 2013, the community began an annual "Harry Stevens Hot Dog Day".^[2] The event includes entertainment, a dachshund race, and a hot dog eating contest.^[2]

In early 2013, Derby City Council and Derby Civic Society jointly announced they would erect a blue plaque (historical marker) to his memory on his first marital home at 21 Russell Street in Derby, England.^[12][13]

• Rippon, Nicola, Derbyshire's Own, The History Press, 2006, ISBN 0750942592.