There are two reasons for that:

1. Georgia Tech is just off the list. I saw another version of this list with the ivy league schools removed and it was there.

2. Many engineers that come out of Georgia Tech stay in the south, making less money due to lower cost of living. Schools in Boston, New York and SV will of course provide higher ROI because jobs in those areas pay more. I made $20k more than many of my classmates who stayed in Atlanta just by moving to Cambridge.

GT is #2 on the public schools list, and just outside of the top 10 overall. GT also blows the roof off of the scale when it's measured by percentage ROI instead of raw dollars.

http://www.thewire.com/national/2014/03/these-are-the-school...

GT and UVA get special shout-outs in the source article-

http://qz.com/193400/here-are-the-american-colleges-and-majo...

If you go to the linked QZ article where they change the computation to take cost into account differently you have UVA and GT (in-state) topping the list with a significant margin.

Yeah, for both engineering and computing fields