Thomas Kalmaku was a young Inuit engineer at Ferris Aircraft and the employer of test pilot Hal Jordan.
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He had a girlfriend named Tegra. They later married and had a son and a daughter but later separated from his wife.
Kalmaku was the first person to know about Hal Jordan's secret, and kept a journal of Green Lantern's adventures. He often assisted the hero, or required rescuing as well as serving as his confidante. Hal had considered him as a replacement Green Lantern for Sector 2814, and the Guardians of the Universe even offered him a Green Lantern Ring (which he declined, famously saying "naw").
Kalmaku was revealed to be one of the "Chosen" who formed the New Guardians. He had the superpower to bring out the best in people. However, he decided to leave the New Guardians to be with his family. He loses his powers when he leaves the team.
After Hal's (several) deaths, he went on a final mission on Hal's behalf, eventually reconstructing the planet Oa.
Kalmaku later became an equal partner with Carol Ferris' in Ferris Aircraft. Despite this, he still does mechanical work for the planes, telling Hal Jordan that a wrench is his power ring.