Henny Hoobin’s father John was a fixture on Montreal’s championship-winning Shamrock Lacrosse Club in the 1870s and 1880s who trained his son in the sport from an early age. Henny joined his father’s team in the late 1890s and his prowess soon helped him surpass his father’s reputation with the club and earned him national fame. In June 1907 Henny retired from the sport because of an injured knee, but came out of retirement the following year when he was selected to represent Canada in the lacrosse tournament at the 1908 Summer Olympics after participating in the trials. At the Games he earned a gold medal with his team after it won its only match against Great Britain 14-10. He returned to retirement after the Olympics and was inducted into the Canadian Lacrosse Hall of Fame as a charter member in 1966.