a Tribute to Hermann KÜMMEL on his 80TH Birthday

One of the undoubted highlights of the 11th International Conference on Recent Progress in Many-Body Theories was the special session on Wednesday, 11 July, 2001 dedicated to the coupled cluster method (CCM), in honour of the upcoming 80th birthday of its founder and staunchest advocate, Hermann Kümmel. It was a special pleasure on this occasion that both Hermann Kümmel and Fritz Coester, the co-founder of the CCM, could be present and give invited talks. It was felt to be especially appropriate to mark Hermann Kümmel's 80th birthday at one of the conferences in this series due to his strong involvement in the series since its inception. Indeed, the esteem in which he is held by the community has already clearly been indicated by his election some years ago to the office of Honorary President of the International Advisory Committee of the conference series...