Ryan Sharkey is Finn Sharkey's father. He is shown to be a wealthy businessman who has very little time for his son. He seems unbothered by Finn's antics and shows him minimal attention.
He is seen in two episodes in Waterloo Road, first when Finn gave drugs to his best friend, Josh Stevenson, and then when Finn attempted to kill himself when Ryan and Mrs Sharkey supposed to move to Los Angeles,
Both times he seems more concerned about his reputation rather than his son. Ryan is not really a good father to Finn and lets his son do anything he wants, and yells at him when he needs his support. Chris Mead got into an altercation with him twice about this.
When Ryan tells Finn they are moving to Los Angeles, he appears unbothered about how his son feels. Although Finn stays at the school until the end of Series 7, his parents aren't seen again.