Mitchell began his swimming career as a record-breaking swimmer and continues as one of its preeminent coaches. An age group breaststroke sensation in Georgia, Brent won 10 SEC titles and 11 All American honors for the University of Florida. As a medley relay member, Brent helped win NCAA and US National titles. A successful high school and club coach for over a quarter century, Brent has been named US National and US  Junior National team coach four times.