Mezue ahịrịokwu na-esonụ: Leonard bụ onye mbụ ruru eru ịbụ onye a họpụtara na
2016, mana ahọrọghị ya mgbe ọ na-egwu Green Bay Gamblers nke United States Hockey League. Mgbe afọ abụọ ya na ndị ịgba chaa chaa, Leonard sonyeere Mahadum Massachusetts Amherst ("UMass"), na-egwu egwuregwu hockey ice ha, ndị UMass Minutemen mgbe ha na-amụ Nkwukọrịta na Njikwa Egwuregwu. Mgbe ya na ndị Minutemen nọ, Leonard dọtara uche nke San Jose Sharks, onye wepụtara ya na agba nke isii, 182nd n'ozuzu na 2018 NHL Entry Draft n'agbanyeghị enweghị kọntaktị ọ bụla na Leonard n'oge usoro predraft. N'afọ nke atọ ya na UMass, Leonard bụ onye ikpeazụ maka Hobey Baker Award ma duru ndị egwuregwu NCAA niile na ihe mgbaru ọsọ, na 27.