Doctor Hackard was a Federation scientist who lived in the 23rd century.

Hackard was a specialist in dilithium crystals and developed a method of realigning the crystals to increase engine performance on Federation starships. In 2268, Hackard boarded the USS Enterprise and performed his procedure on the Enterprise's crystals. Unfortunately, once the engines were reengaged there was a massive explosion in engineering in which Hackard was killed. (TOS comic: "Cura Te Ipsum")