Spitz & Associates in Madison, Wisconsin. (Hereafter, all references to petitioner are to William Spitz.) During the years at issue, petitioner was a partner in the certified public accounting firm of Baillies, Denson, Erickson and Smith (Baillies, Denson) of Madison, Wisconsin, engaging in financial consulting and tax return preparation, among other things. Previously, he was employed by the Internal Revenue Service in Chicago, Illinois, as a revenue agent from 1961 to 1964.