John Worth

From Shadow Unit Wiki

John Worth is (presumably) Daphne Worth's father. He is a retired electrical engineer [1] who has started teaching honors science at the local high school, as "sort of a guest teacher." [2] Daphne and John are on somewhat awkward terms with each other. [3]

(We presume that John is Daphne's father based on his showing up at the top of the list of invitees to Daphne's and Tricia's Wedding.)