A native of Lizard Lick, North Carolina, Grizzard was a two-sport athlete at East Wake High School, where he played basketball and football.
A two-way player who played quarterback and safety, he was his class' valedictorian, graduating with a 4.75 GPA.
[1] He played college football at Yale from 2008 to 2011 before opting to switch to a student coaching position.
[3] On February 23, 2024, Grizzard was hired by the Tampa Bay Buccaneers as their pass game coordinator under head coach Todd Bowles.
[4] On January 31, 2025, Grizzard was promoted to offensive coordinator, replacing Liam Coen, after his departure to become head coach of the Jacksonville Jaguars.