- you may also be looking for the Great Teacher, a device from Sigma Draconis VI.
A teacher is an instructor, usually in a predefined subject or skill.
Hudak was an Antaran teacher in xenomythology who was doing research on Xantoras when a xenophobic group overthrew the government in early 2153. (ENT: "The Breach")
Bethany was a one-quarter Skagaran teacher, that instructed primary school students. She instructed Humans during the day, and illegally instructed skagarans at night. She taught her students having them use slats. After Enterprise NX-01 arrival on her planet, in late 2153 the Humans became more accepting of other cultures, and she openly taught skagarans, and humans. (ENT: "North Star")
Miss Gladstone was assigned to the primary school aboard the USS Enterprise-D in 2365 when Ian Troi was admitted. (TNG: "The Child")
In 2366, Lieutenant Ballard was the teacher of the ship's school on board the Enterprise when Data tried to enroll Lal. (TNG: "The Offspring")
In 2368, Miss Kyle was the teacher of the Enterprise's primary school. (TNG: "New Ground")
After arriving on Deep Space 9, Keiko O'Brien started a school and became the teacher, schooling some station children, including some Bajorans, Nog, and Jake Sisko. (DS9: "A Man Alone")
Later on in 2369, her husband, Miles O'Brien, acted as a substitute teacher for the class. (DS9: "The Nagus")
In an illusion created for William Riker that set him in 2383, Greenburg was the teacher aboard the Enterprise. (TNG: "Future Imperfect")
Sometime during the 24th century, Talur was a teacher and scientist on Barkon IV. (TNG: "Thine Own Self")