Jack originally came to Odyssey in the 2-part episodes #280: "Gone..." and #281: ". . . But Not Forgotten" filling in for the loss of Whit (the voice actor Hal Smith, famous as Otis on The Andy Griffith Show had died). For a number of years, he co-manages "Whit's End", but eventually he and Joanne open the "J & J Antique Gallery".
Jack is known for his passive nature, preferring to remain behind-the-scenes rather than take aggressive action or confront enemies. This attitude is displayed by his actions in the Blackgaard saga and the Novacom saga. Jack's personality often clashes with that of Jason Whittaker, with whom he co-managed "Whit's End" for a time; while Jason wants to implement the latest technology and take numerous risks, Jack urges caution. Despite their differences, the two remain friends, even sharing a house for much of the series.