[1][2] He is the brother of former Olympian badminton player Jürgen Koch.
Harald and his younger brother Jürgen Koch were born in badminton enthusiast family.
Their father Herbert Koch served as the manager of Askö Traun, Austrian youth committee and as OÖBV president; and led their team in winning the Bundesliga title many times.
[4] Internationally, Harald has won titles in European grand prix, which includes his titles in Czechoslovakia, Slovakia, Romania and France and several other runner-up performances as well in Slovenia, Hungary, Austria and Croatia.
At present, he is working as a Sporting goods dealer.