Davis joins the Dolphins after spending the last three seasons as offensive line coach at USC, which has won the national title the last two seasons.
As for Hill, he was in private business in Dallas since 2001 after an 11-year stint with the Detroit Lions.
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On the subject of coaches, two more members of last year's staff have found jobs, with Bob Sanders and Robert Nunn joining Jim Bates in Green Bay.
Sanders was the Dolphins' linebackers coach last year, while Nunn was a defensive assistant.
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The Dolphins have allocated 10 players to NFL Europe, which begins play on April 2.
Remember that NFL Europe participants do not count against an NFL roster until the final cuts to 53 players.