Steaks over an inch thick are best on the grill, but their thickness makes it a bit more tricky to cook through and get that excellent char on the outside. The food experts at Serious Eats tells us the best technique for grilling "Cowboy Chops" is to use a gentle heat first, then finishing it over high heat to sear.
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The reason this order is better, they say, is that the pre-warmed steak will sear faster and therefore you'll reduce the likelihood of overcooking the steak. In true Serious Eats scientific fashion, the article also offers timing and temperature recommendations, such as flipping every five minutes. Check out the article for the full instructions and slideshow.
For more steak grilling techniques, see also seven myths about grilling a steak.
How to Grill a Gigantic Rib-Eye Steak [Serious Eats]