There is actually an article about him that accompanies the chart.
He is also the Vice Chancellor for University Affairs and Athletics, General Counsel and Secretary for the University and the Medical School, and a fully tenured professor at the law school.
"Those are a lot of responsibilities, but even so, the $2.56 million compensation package Williams received at Vanderbilt in 2009 — double that of any other athletics director — is somewhat misleading.
Williams had a base salary of $772,000 and bonuses of $185,000, but the lion's share of his salary came from $1.5 million in deferred and retirement income. That figure reflects an ongoing, growing account that was put in place in 2007 for Williams and top university officials, when Gordon Gee resigned as Vanderbilt's chancellor to become president at Ohio State."