According to ESPN’s Adam Schefter, former Indianapolis Colts quarterbacks coach Clyde Christensen has been hired to be the offensive coordinator for the Miami Dolphins under new head coach Adam Gase:
After 14 seasons with Indianapolis, Clyde Christensen is leaving to become the Miami Dolphins' offensive coordinator, per a Colts source.
— Adam Schefter (@AdamSchefter) January 17, 2016

Christensen was one of the team’s longest tenured coaches, as he’s been with the team since 2002–having held a number of different offensive coaching positions.
Most recently, he was the Colts quarterbacks coach (2012-15), but he’s also been the team’s offensive coordinator (2009-11), assistant head coach and wide receivers coach (2008), and wide receivers coach (2002-07).
Of course, Christensen is one of the few Colts coaches who remained between the Peyton Manning and Andrew Luck regimes. Christensen was credited with helping both quarterbacks, particularly in Luck’s case as a young quarterback.
It’s worth noting that per Fox Sports NFL Insider Alex Marvez, the Dolphins also interviewed another former Colts coach, as Frank Reich also interviewed for the position:
Source tells @NFLonFOX that @MiamiDolphins have interviewed Frank Reich and Clyde Christenson for OC job
— Alex Marvez (@alexmarvez) January 16, 2016
As you may recall, Reich was a member of the Colts coaching staff, as a wide receivers coach (2011), quarterbacks coach (2009-10), and offensive coaching staff assistant (2008). Most recently, Reich was the San Diego Chargers offensive coordinator (2014-15).