Detectives want to get in contact with Roberto Gouveia about two assaults that occurred in Holloway near to Camden Road and Brecknock Road on September 11, 2011.
Anyone who can help officers track him down is asked to contact the Sapphire Unit at Islington Police on 020 7421 0282 or Crimestoppers anonymously on 0800 555 111.
Mr Gouveia is a 33-years-old Angolan national, 5ft 8in tall and of stocky build. He occasionally wears glasses and was last known to be based in the Hornsey area. He has links to Scotland.