Before Union: Williamson prepped at Hewitt Trussville High School were he played soccer, football, basketball, and baseball. In soccer, he helped lead his team to a region tournament runner-up finish, and also a second place finish in the Lakeshore Shootout. As a senior, Williamson was named third team All-Metro. He was also a part of the ninth grade basketball team that won the county championship. Williamson has been successful off the field as well with memberships in the Honor Society and Mu Alpha Theta Math Honor Society. He was also the president of SADD.