Jack Michael McMullen (born 22 February 1991) is an English actor and writer. He played Josh McLoughlin in the long-running Channel 4 soap opera, "Brookside", from 2002 to 2003; Timothy "Tigger" Johnson in the long-running BBC One children's television serial, "Grange Hill", from 2004 to 2008; and Finn Sharkey in the BBC One school-based drama series, "Waterloo Road", from 2010 to 2012. He has also acted in other British television series such as "Casualty", "Doctors", "The Street", "The Bill", and "Moving On", with starring roles in "Little Boy Blue", and "The First Team".