He is portrayed by Victor Garber.
Very little is known of Halsey's past, although early in his career he worked alongside Commander Kelly Grayson's father. At some point, he is promoted to Admiral. He serves as an informal mentor to Ed Mercer, having known him since Mercer's days as a student at the academy Union Point.
In September, 2419, on the recommendation of Kelly, Halsey gives Ed command of the USS Orville despite his recent history of irresponsible behavior. Though he had his reservations, he was willing to give Ed a chance because of his stellar academic record and resume prior to his divorce. Unbeknownst to Ed, Halsey also quietly transferred Kelly to the Orville as his new First Officer. Though Ed complains, Halsey forces the two to work together.
Halsey next appears in February, 2420, when he calls the Orville to inform them that they will soon host ambassadors of the Bruidians and the Navarians, as well as a Union archaeologist who will examine the Lopovian birthing bucket to determine which species has a claim to Lopovius.
In April, however, Halsey and Kelly's secret slips out that the Admiral only granted Ed captaincy thanks to Kelly's recommendation. Halsey insists that the reason he was originally promoted is irrelevant because Mercer has proven that he has the talent and the skills necessary to successfully lead a Union ship. Halsey's words offer little consolation, and Ed ends the call on a dour note.
- Halsey may be named after the real-life Admiral Halsey, William Halsey Jr., who commanded the USS Enterprise during World War II.