He originally represented Zimbabwe changed nationality in 1999 to the United States. He is the course record holder at the Manchester Road Race, in Manchester, Connecticut. He holds the event record of the Gasparilla Distance Classic"s 15k road race held in Tampa, Florida, United States of America. On February 26, 1994, Hanneck set that mark at Gasparilla with his time of 42:35.
He won a silver medal at the 1994 Commonwealth Games in Victoria, and finished tenth in at the 1995 World Championships in Athletics in Gothenburg. His personal best time was 13:14.50 minutes, achieved in June 1994 in Rome. He won the race in 1994 and 1995, setting the course record in 1995 with a time of 21:19 on the 4.748 mile (7641 km) course. He also holds the course records for the BOclassic 10K race in Bolzano, Italy, having won with a time of 28:02.1 in 1991, and the Marin Marin Memorial Day Races 10k, held in Kentfield California, United States of America, with a time of 28:45 in 1994. Hanneck was the 1993 winner of the Emsley Carr Mademoiselle (Miss)
