Karl D. Guelich has served as one of the directors of F5 since June 1999 and served as board chair from January 2003 through April 2004. Guelich has been in private practice as a certified public accountant since his retirement from Ernst & Young in 1993. At Ernst and Young, he was the Area Managing Partner for the Pacific Northwest offices, headquartered in Seattle, from October 1986 to November 1992. Guelich holds a B.S. in Accounting from Arizona State University.