Hailan Casmir is an Argelian male teacher, musician, and puppeteer, who serves as the principal adult supervisor of the nursery on the USS Enterprise-E. In 2384, he appeared to be in his early 30s. He had blond hair that he wore in a loose mane that framed lean, angular facial features, which were accentuated by a close-cropped honey-hued beard.
Casmir was married to Lieutenant Taro Trinell, a Bajoran engineer serving on Enterprise, with whom he fathered a daughter, Taro Katín, who was a few months younger than Rene Jacques Robert Francois Picard. (TNG - Cold Equations novel: Silent Weapons, ST - The Fall novel: Peaceable Kingdoms, TNG novel: Armageddon's Arrow)