Spud Wilson is not who you'd imagine being at a slam dunk contest
I am not sure I know Spud Wilson but I did meet Spud Webb once. 
Sorry- Spud Webb! He's one of the shortest players in the NBA history
True. It is a great story. There should be a movie made about him one day.
It'd be good. Starting off with him growing up in poverty, growing up to be in the NBA
Right. All while being 5 foot 6 inches tall. It was really an uphill battle for him. 
It was cool that he judged the 2010 dunk contest, too. Kind of full circle
That is cool. What do you think his vertical leap is in order to be able to dunk? 
Has to be high, right? He hasn't lost a dunk contest either
Yes, I would think it has to be over 40 inches given his height. At 5' 6" you don't need any tricks. If you pull off a dunk you win.