Isaac White, who competes as Sir Isaac, is a 5'10" professional dunker out of Houston with a vertical reported at 55 inches. That number is the reason a man ten inches under six feet has built a career jumping over things most people would not attempt to jump over at all.
Houston is his base and his proving ground. He built his record on the H-Town Blacktop circuit, winning the city's Blacktop dunk contest and then defending it repeatedly, and by the last published count he was up to nine Blacktop titles. Winning a contest once is a good night. Winning the same one nine times is a different claim, because by then every entrant has studied your bag and turns up prepared for it.
The dunk that put him in front of a national audience was over the Phoenix Suns Gorilla. He used the mascot as the obstacle and finished with an Eastbay Funk, a between-the-legs taken from the baseline side, in a live arena. Sports Illustrated picked the clip up, and the comparison people reached for at the time was that a recent NBA dunk contest had been won with a simpler version of the same idea.
He has also been the subject of a VICE Sports documentary short about the working life of a professional dunker in Houston, which is a rarer credit than it sounds. Most dunkers get covered for a single clip. Very few get filmed as a subject.
The through line of the career is obstacles: mascots, people, cars. At 5'10" the rim height is already the hard part, so putting a body between himself and it is the specialisation he chose, and the Blacktop record suggests he has kept finding new versions of it year after year.