After agreeing to become City's new boss on the Sunday, Parkinson was officially unveiled as Bantams chief on Monday 29 August 2011.
His four years at the helm at the Coral Windows Stadium currently makes him the sixth longest-serving manager in the Premier League and Football League combined.
He is City's longest-serving manager since Trevor Cherry, who led the Bantams between 1982 and 1987.
In fact, only Cherry and Bryan Edwards have managed City for longer than Parkinson since the 1950s.
This Saturday afternoon's encounter with Port Vale at Valley Parade will be Parkinson's 224th in charge of Bradford City.
Under Parkinson's leadership, City have enjoyed countless memorable occasions, including cup triumphs over the likes of Arsenal, Aston Villa, Leeds United, Sunderland and Chelsea, a place in the Capital One Cup Final and the FA Cup Quarter Finals, plus promotion into League 1 via the Play-Offs in 2013.
In each of Parkinson's four campaigns as manager of the club so far, City have also improved their final league position each season.