Giancarlo Wu was a human male and was the senior attaché to the Federation Ambassador to the Klingon Empire. He began working at the Federation Embassy on Qo'noS sometime prior to 2369. (TNG novel: A Time for War, A Time for Peace) In 2376 Wu began working for Ambassador Worf and traveled aboard the IKS Gorkon with him on his first mission to the planet taD. (TNG novel: Diplomatic Implausibility)