Welcome to SportsNation! On Friday, former NCAA executive Greg Shaheen, who oversaw the NCAA Division I Men's Basketball Championship for 12 years, stops by to chat as Selection Sunday approaches. ESPN hired Shaheen to provide insight into the creation of the tournament bracket.

Shaheen, @gashaheen, resigned in April 2012 from his post of executive vice president, championships and alliances, where he launched the NCAA tournament's "First Four" round of games, as well as negotiating the orgnization's TV broadcast deals.

Send your questions now and join Shaheen Friday at 3:45 p.m. ET!

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