[1] He gained notoriety for successfully challenging the authority of Wisconsin district attorneys, and Milwaukee County's corporation counsel, to issue arrest warrants in child support cases.
[3] When O'Connell was elected to the Milwaukee County Circuit Court in April 1968, Republican Governor Warren Knowles appointed Cannon to succeed him.
[6] In 1969, President Richard Nixon nominated Cannon to serve as United States Attorney for the Eastern District of Wisconsin, replacing James B.
[8] While in office, Cannon pursued federal charges in connection to an incident of draft-card burning in 1968[9] and conducted a grand jury investigation into the activities of the Balistrieri underworld family.
[2] He also served as president of the Milwaukee Bar Association in the early 1980s[12] and chaired the board of Federal Defender Services of Wisconsin.