He follows George Wilson, Don Shula, Jimmy Johnson, Dave Wannstedt, Jim Bates, Nick Saban, Cam Cameron, Tony Sparano, Todd Bowles, Joe Philbin and Dan Campbell.
Bates, Bowles and Campbell all served on an interim basis.
Here’s a look at Gase by the numbers:
• At 37 years old, Gase becomes the youngest head coach in the NFL. Gase was born March 29, 1978.
• When the 2015 season ended, the youngest head coach in the league was Campbell at 39 years old.
• Gase also becomes the youngest head coach in Dolphins history. Before Campbell, that distinction belonged to Don Shula, who was 40 when he was hired in 1970. Bates was the oldest when he took over during the 2004 season at 58.
• The other Dolphins head coaches and their age at the time they took over: George Wilson, 41; Jimmy Johnson, 52; Dave Wannstedt, 47; Nick Saban, 53; Cam Cameron, 45; Sparano, 46; Bowles, 48; Philbin, 50.
• Gase was born in Ypsilanti, Michigan, making him the second Dolphins head coach born in that state along with Bates. Michigan now ties Texas (Johnson, Campbell) in having produced the most Dolphins head coaches.
• The other native states of Dolphins head coaches are Illinois (Wilson), Ohio (Shula), Pennsylvania (Wannstedt), West Virginia (Saban), North Carolina (Cameron), Connecticut (Sparano), New Jersey (Bowles) and Massachusetts (Philbin).
• Gase is the fifth of the last six Dolphins head coaches who previously was an offensive assistant. He followed Cameron, Sparano, Philbin and Campbell. The one exception was Bowles, who was a secondary coach along with being assistant head coach.
• Gase is the first Dolphins head coach without NFL or college playing experience.
• Gase has been working in the NFL for 13 years, including the first in the scouting department for the Detroit Lions.
• The Dolphins become Gase’s fifth team, following Detroit, San Francisco, Denver and Chicago.
• Under Gase’s tutelage, veteran Chicago Bears quarterback Jay Cutler finished the 2015 season with the highest passer rating (92.3) of his career. Cutler also had an interception rate of 2.3 percent, the best showing of his career for a season where he played at least 12 games.
• In Gase’s one season in Chicago, the Bears went from 27th in rushing offense in 2014 to 11th and from 28th in yards per pass play to 12th — and that was despite Pro Bowl wide receiver Brandon Marshall having been traded to the Jets last offseason and two-time 1,000-yard receiver Alshon Jeffery limited to only nine games because of injuries.
• In his first season as offensive coordinator in Denver in 2013, Gase oversaw an offense that set NFL records with 76 touchdowns and 606 points. That season, Manning was named the NFL’s Most Valuable Player after breaking NFL single-season records for passing yards (5,477) and passing touchdowns (55).
• Over Gase’s two seasons as Denver offensive coordinator, the Broncos led the NFL in scoring offense (34 points per game), total offense (430.1 yards per game) and passing offense (315.8 yards).
• In Gase’s two seasons as Broncos offensive coordinator, Denver had seven different offensive players selected to the Pro Bowl: Manning, RB C.J. Anderson, WR Demaryius Thomas, WR Emmanuel Sanders, TE Julius Thomas, T Ryan Clady and G Louis Vazquez.
• Gase had one of his players earn a Pro Bowl invitation in each of his two seasons as Denver wide receivers coach — Brandon Marshall in 2009 and Brandon Lloyd in 2010.
• Lloyd led the NFL in 2010 with 1,448 receiving yards, the first 1,000-year season of his career.
• In 2009, Marshall tied for third in the NFL with 101 catches and set a league record with 21 receptions in a December game at Indianapolis.
• In Gase’s first season as Denver’s quarterbacks coach in 2010, Tim Tebow set a Broncos record for QBs with 660 rushing yards.
• In Gase’s second season, Peyton Manning earned the NFL Comeback Player of the Year award.