Kazunori Itou has a series composition credit for .hack//SIGN.
series composition
TV anime / 2002
script
TV anime / 1981
OVA / 2002
original plan
TV anime / 1983
TV anime / 2005
Movie / 2005
original creator
TV anime / 2009
OVA / 1985
original story
OVA / 1984
Special / 1996
Special / 1994