The Pittsburgh Penguins continue to hold faith in head coach Mike Sullivan by signing him to a four-year contract extension, general manager Jim Rutherford announced Friday.Sullivan originally took over as the Penguins coach back in December 2015, when Pittsburgh was out of playoff position and in ninth place in the Eastern Conference. He helped them finish the year with a 33-16-5 record to push them into the second-place spot in the east. They went on to win the Stanley Cup. “Mike has done a great job delivering four, 100-plus point seasons with our team,” Rutherford said in a press release. “To win back-to-back Stanley Cups in this era speaks volumes of him as a coach. His instincts in managing the inter-workings of our team both on and off the ice has been impressive.”Under Sullivan, the Penguins have won 38 postseason games (most in the NHL), and they’ve also scored 994 goals (tied for first with Tampa Bay). The 51-year-old, who played 11 seasons in the NHL, has the second-best points percentage in franchise history (.637) and third-most wins in team history (174).This past season, Sullivan coached the Penguins to a 44-26-12 record (100 points) before Pittsburgh suffered an early playoff exit after being swept by the New York Islanders in the first round. NHL free agency 2019: Complete list of all 31 teams’ free agentsJust one year later, Pittsburgh finished second in the NHL during the regular season and won yet another Stanley Cup title. Sullivan became the first American head coach in NHL history to win more than one championship and the first since Scotty Bowman to win back-to-back titles (Detroit in 1996 and 1997).