David Alexander is currently in his 6th season as the goaltending coach for the St. Louis Blues. He holds the record for being the youngest goalie coach in the NHL for six consecutive seasons. In 2019, he became the youngest goalie coach to win a Stanley Cup. During David's tenure, Blues' goalies have consistently ranked among the league's best, with notable performances from Carter Hutton (.931), Jordan Binnington (.927), Jake Allen(.927), and Ville Husso(.919).

Before joining the Blues, Alexander was the goaltending development coach for the Tampa Bay Lightning, and goaltending and video coach for the AHL's Syracuse Crunch. In addition to his team achievements, Alexander has contributed significantly to Hockey Canada, working at various levels to develop goaltending talent nationally.