Former NBA Refs

[actuary77]

I noticed that there are two former NBA referees - Joe DeRosa and Sean Corbin - who left the NBA and now work college D1. I believe they did the switch last year and have both been given assignments in last year's and this year's NCAA tourney.

Do we know if they left the NBA voluntarily or were they forced out?

I'm not trying to spread rumors or be gossipy about this, but I'm genuinely curious. I know a lot of officials aspire to get to the NBA level (and the competition is very tough) so voluntarily leaving the league is a bit unusual to me. Plus the fact that DeRosa has worked a number of NBA finals already.