He had a wife named Angie and a sister-in-law named Hope, who resided in Boston. Harkins tried to pair Reginald Barclay with Hope. Harkins also had a female cousin who owned a beach house in Malaysia.
Harkins, as Barclay's boss, discouraged Barclay's odd theories about contacting the USS Voyager, preferring to concentrate on a plan in partnership with the Vulcans. He refused to allow Barclay to discuss the matter with Admiral Owen Paris. He believed that Barclay was spending too much time in a holo-simulation of Voyager and its crew, and was having a relapse of his holo-addiction.
Harkins ordered Barclay to counseling and removed him from the project. Harkins ordered a security team to arrest Barclay when he broke into the MIDAS array. Barclay later proved his theories were correct and established communications with Voyager. (VOY: "Pathfinder", "Inside Man")