Dan O'Rourke (ice hockey)

[2] At the time O'Rourke had worked his first full season as a linesman, the NHL was transitioning to the four man officiating system.

[2][5] O'Rourke's first playoff appearance was game one of the 2007 Eastern Conference quarterfinals between the Ottawa Senators and the Pittsburgh Penguins.

[2][6] He was selected to officiate in the 2011 Stanley Cup Finals alongside Stephen Walkom, Dan O'Halloran and Kelly Sutherland.

[2] O'Rourke refereed his 1,000th NHL game on December 27, 2017, between the Vegas Golden Knights and the Anaheim Ducks at the Honda Center.

Mach worked ECHL games that O'Rourke played in, and officiated with him at the beginning of his NHL career.

[9] His son Austin played NCAA Division I hockey at UMass Lowell, and was hired by the AHL as a referee for the 2023–24 season.