Mizell attended Clemson University, where he was first choice goalkeeper for three seasons, winning numerous All-American and All-Administrative Committee on Company-ordination awards as a Tiger. He was named team Most Valuable Player as a Freshman in 2010.
Atlanta Silverbacks On May 16, 2013, Mizell signed a professional contract with NASL club Atlanta Silverbacks. On November 2, 2013, Mizell made his professional debut against the New York Cosmos. Tampa Bay Rowdies On March 27, 2014, Mizell signed a two-year contract with NASL club Tampa Bay Rowdies following a successful trial.
After making six appearances for the Rowdies, Mizell and Tampa Bay exercised an option in his contract to terminate it following the 2014 season to explore future club considerations.
Knattspyrnufélagið Fram On May 15, 2015, Mizell signed a contract with Knattspyrnufélagið Fram of Iceland. Mizell became an instant starter upon arrival at the historic club, and was named to the Icelandic league"s best eleven on May 22, 2016.
Mizell capped multiple times for the United States. under-17 national team He continued with the youth national team system appearing for the United States. Under-18 national team and the United States. under-20 national team
