Doug Salomon
One thing to note - this really only works well with think steaks. So, 1.5 - 2 inches is good.
This is a good technique for cooking steaks.
The common way to cook a steak is to start by searing the outside and then letting it cook through.
A reverse sear is done in the opposite way (hence the name). Cook the steak at a lower temperature until it is just about done and then sear the outside.
This results in a really well cooked steak, where the inside is almost entirely one level of done-ness from top to bottom, and the outside is just awesome.