Karen Loews was a female Human who lived in the 24th century. In the 2370s, Loews was a medical doctor serving in Starfleet with the rank of Lieutenant. Loews was a psychiatrist and was assigned to the Institute, where she cared for those whose accelerated critical neural pathway formation procedure had caused them to develop psychiatric problems.
When Doctor Loews was assigned to the Institute, she separated Jack, Lauren, Patrick and Sarina Douglas from the other residents so that she could attempt treatment separately. She had little success with the four, having the most trouble with Jack. In 2374, Loews decided to bring them to Deep Space 9 so they could meet Julian Bashir, hoping that by meeting someone who had had the same procedure but had lived a normal life, they would be inspired to do the same. (DS9 episode: "Statistical Probabilities")
In 2375, Doctor Loews gave Bashir her permission as Sarina's legal guardian for Sarina to undergo a procedure that could reverse the damage her accelerated critical neural pathway formation procedure had done. (DS9 episode: "Chrysalis")
Doctor Loews' work with the patients at the Institute would make a contribution to helping genetic augments to be rehabilitated. Among those was Jack, who Doctor Loews certified of being free of any side effects of his childhood genetic alterations. (STO novel: The Needs of the Many)