Greskrendtregk was a male Ktarian and a member of Starfleet who held the rank of ensign in 2371. Greskrendtregk was stationed on Deep Space 9. He was married to Ensign Samantha Wildman who was stationed on the USS Voyager.
Greskrendtregk and Samantha had been visiting Doctor Julian Bashir on DS9 in the hopes that he would be able to aid them in getting pregnant. The treatments were successful - Samantha was (unknowingly) pregnant when she left DS9 aboard Voyager in 2371. Voyager was then stranded in the Delta Quadrant where Samantha subsequently gave birth to their child, Naomi Wildman in 2372. (VOY episode: "Deadlock")
Samantha had considered naming her child after Greskrendtregk, had the child been a son; the name is an honored one in his family (he was the fifth generation male of his family line to have that name). (VOY episode: "Dreadnought")
In 2372 on the one-year anniversary of the disappearance of Voyager, Greskrendtregk, who went by the name "Gres" organized a get-together of families and close friends of the crew of Voyager. The get together was held on DS9. By the second anniversary in 2373, Gres had taken a sixth month leave of absence from Starfleet and was living on Ktar where the second anniversary get-together was held. A year later, Gres was back on DS9 where he hosted the third anniversary get-together.
In 2374, Gres, along with all of the families of the Voyager crew, heard the news that Voyager had survived and was stranded in the Delta Quadrant. Gres was congratulated by his assorted new friends among the Voyager relatives at the discovery that he was now a father. Gres again planned an anniversary party, but it would be held on the anniversary of the day they found out their loved ones were still alive. (VOY - Distant Shores short story: "Letting Go")
By 2382, Gres had resigned his Starfleet commission, instead working with several civilian research labs due to his and his wife's decision to never be separated by their jobs again. (VOY novel: Acts of Contrition)