sentences:  Jo Ritzen
  
  Jozef Marie Mathias "Jo" Ritzen (born 3 October 1945) is a retired Dutch politician of the Labour Party (PvdA) and economist.Ritzen worked as researcher at the Delft Institute of Technology from July 1969 until June 1972 and at the Erasmus University Rotterdam from June 1972 until July 1976.