Yasuhisa Katou has a character design credit for Azumanga Daioh.
character design
TV anime / 2002
storyboard (ep 1, 2, 4, 6)
Special / 2009
episode director (ep 1, 2, 4, 6)
OVA / 2001
director
OVA / 2008
OVA / 2004
OVA / 2007
OVA / 2009
OVA / 2010