 On 1 June 1968, Petersen married Joanne Newfield in Nassau, Bahamas, with fellow Bee Gees member Vince Melouney as the best man.Joanne had worked as a personal assistant to Brian Epstein up until his death, and then for Robert Stigwood.After the couple's wedding Petersen and Newfield went on honeymoon in Majorca, which was spoiled somewhat when Joanne fell ill with German measles.